Naming Your Baby in Japan: Rules, Kanji & Options for International Families

May 31, 2026 Maternity Prep Navigator Editorial ~14 min read

Choosing a name for your baby is one of the most meaningful decisions you will make. For international families in Japan, it also comes with a practical dimension: the name you write on the birth registration form (出生届, shusshou todoke) becomes your child's legal name on record in Japan. Understanding which characters are permitted, how foreign names are handled, and what the registration process involves will help you choose a name with confidence — and avoid surprises at the city office window. This guide explains the rules in plain English, with the corresponding Japanese section below for reference.

1. Overview: Naming and the Birth Registration

In Japan, giving your baby a name is not just a personal choice — it is inseparable from a legal procedure. When you submit the birth registration form (出生届, shusshou todoke) at the city or ward office, the name you write on that form becomes the name recorded in Japan's civil registration system. For children who will be entered into the Japanese family register (戸籍, koseki), this is the name that appears on official Japanese documents for life.

The registration framework differs depending on your family's situation. The two most relevant scenarios for international families are:

• At least one parent holds Japanese nationality: The child will typically be entered into the koseki. Japanese naming rules — including restrictions on which characters may be used — apply to the name entered in the koseki.
• Both parents are foreign nationals: The child does not acquire Japanese nationality and is not entered into the koseki in the same way. The birth registration still creates an administrative record in Japan, but the child's official name as a citizen of another country is determined by that country's rules (typically confirmed through embassy registration). The name written on the Japanese shusshou todoke in this case is still an important administrative record, and in practice many offices will accept the name as written in katakana or in the parent's preferred script — but confirm with your local office.

For the full picture on birth registration — deadlines, where to submit, and embassy registration — see our dedicated guide: Birth Registration & Nationality for Binational Families.

2. Which Characters Are Permitted for Japanese Names?

For children who will be entered into the koseki, Japan's family registration law (戸籍法, koseki-hou) and its implementing regulations restrict the characters that may be used in a child's given name (名, na / mei). The permitted character types are:

Kanji (Chinese characters used in Japanese)

Not all kanji may be used in personal names. The rules generally permit two sets:

• 常用漢字 (jouyou kanji): The list of kanji designated for general use in modern Japanese, published by the Cabinet. The specific characters on this list are defined in official government notifications and are subject to periodic revision — for the current list and any recent additions, refer to the Agency for Cultural Affairs (文化庁) or the Ministry of Justice, or ask at your city office.
• 人名用漢字 (jinmeiyou kanji): An additional list of kanji approved specifically for use in personal names, established under the family registration law's implementing regulations. Again, the specific characters on this list are subject to revision; the current authoritative list is maintained by the Ministry of Justice.

A kanji that does not appear on either list cannot be used in the koseki entry for a child's given name, even if the character exists in Japanese writing. If you have a specific kanji in mind, it is worth checking with your city office before settling on a name — especially for unusual or classical characters.

Hiragana and Katakana

Both hiragana (hiragana) and katakana (katakana) may be used freely in a child's given name. Many Japanese names are written entirely in hiragana or katakana, or in a mix of kanji and kana. Katakana is also the standard way to represent foreign names or sounds that do not have a corresponding kanji.

Roman alphabet (Latin letters)

Latin alphabet characters (romaji) cannot be entered in the name field of the koseki. If you wish to give your child a name from a foreign language, the standard approach for koseki registration is to render it in katakana — a phonetic transcription of the name's sounds. The Latin-script version of the name can then appear on the child's foreign passport (registered through the home country's embassy) and can be used in everyday international contexts, while the koseki record carries the katakana version.

Reading (pronunciation) freedom and its limits

Japanese parents have historically had considerable freedom in choosing how a given kanji name is read (pronounced). A single kanji can have multiple possible readings, and names do not always follow standard dictionary readings. However, extremely unusual or hard-to-read combinations — sometimes referred to as "kirakira names" in popular discourse — have been a topic of public debate, and the 2025 furigana reform (described in the next section) introduced a framework for recording official readings. In practice, city offices may ask for clarification if a proposed reading is very unusual, but acceptance depends on the specific office and situation. There is no single fixed rule on exactly how "unusual" is too unusual; when in doubt, ask at your city office before submitting the form.

3. Furigana (Reading) Registration: The 2025 Reform

A significant change took effect in Japan's civil registration system in 2025 (令和7年). Under reforms to the Family Registration Act, the reading of a child's name in the koseki — the phonetic reading, written in hiragana — became an official registered element. Previously, the family register recorded the name's characters but did not officially record the reading as part of the koseki entry.

In practical terms, this means:

• When you submit the shusshou todoke, the reading (振り仮名 / furigana, also called 読み仮名 / yomigana) of the child's name will be recorded in the koseki.
• The officially registered reading will appear on future koseki documents and may affect how the child's name is processed in official contexts.

The details of how this reform is implemented — including what readings are considered acceptable, and how unusual readings are handled — are still being worked through at the administrative level. We strongly recommend asking your city or ward office about current practice before submitting the birth registration form. The reform was introduced under the Family Registration Act (戸籍法) amendments that came into force in 2025; for the authoritative text, refer to the Ministry of Justice (法務省) or e-Gov Law Search.

For international families: if you register a katakana name for a child whose name comes from a foreign language, the furigana/yomigana field will reflect the katakana reading. This is generally straightforward. For kanji names with an intended reading that the parents have chosen (rather than a standard reading), clarify with your office how the reading will be recorded.

4. Case by Case: Your Family Situation

Case A: Both parents are foreign nationals — child does not hold Japanese nationality

If both parents are foreign nationals, the child born in Japan does not acquire Japanese nationality and is not entered into the koseki as a Japanese national. The birth registration you submit in Japan creates an administrative record of the birth, but the child's official name as a foreign national is determined through your home country's embassy registration process and the nationality rules of your home country.

In practice, for the Japanese administrative birth record, many city offices record the child's name in katakana (a phonetic rendering of the foreign name). The name that matters most for the child's identity documents — passport, foreign birth certificate — is the name registered through the embassy. Confirm with both your city office and your home country's embassy how the name should be written in each system, and whether there are any consistency requirements between the two.

For more on birth registration in this scenario, see: Birth Registration & Nationality for Binational Families.

Case B: One parent holds Japanese nationality — child will be entered in the koseki

When at least one parent is Japanese and the child will be entered into the koseki, the Japanese naming rules described in Section 2 apply to the name as it appears in the koseki. This is the most common scenario where international families face the practical question of how to give a child a name that works in both Japanese and another language.

The child's given name in the koseki must use only the permitted characters (jouyou kanji, jinmeiyou kanji, hiragana, or katakana). If you want a foreign-language name for your child, the koseki entry will carry a katakana rendering of that name. The foreign-language version appears on the child's foreign passport.

Regarding the family name (姓, sei): in the koseki, the family name follows the rules for the relevant Japanese entry. For bicultural families, how the family name is structured in the koseki depends on the parents' marriage registration and related procedures — this is a separate topic that your city office can advise on.

Case C: International marriage — middle names and how Japan handles them

Japan's family register system uses a two-field structure: family name (姓, sei) and given name (名, na / mei). There is no dedicated "middle name" field in the koseki. If your child has a middle name in your home country's naming convention, the koseki may record this as part of the given name field (for example, combining first name and middle name into a single given name entry), or the middle name may not appear in the koseki at all.

The practical implications depend on your city office's practice and on how your home country's passport handles the name. Ask your city office specifically how middle names are handled before submitting the registration. On the child's foreign passport (registered through the embassy), the name — including any middle name — will follow the embassy's rules and your home country's passport format.

5. Bicultural and Bilingual Name Strategies

Many international families in Japan choose names that work well across two or more languages and cultures. The following are general patterns that families consider — this is not a recommendation of any particular approach, as the right choice is entirely personal and depends on your family's languages, cultural identities, and practical goals.

Names that sound similar in two languages

Some families find names whose pronunciation is similar enough in both languages to be recognizable to speakers of either. For instance, a name might have a natural-sounding kanji rendering in Japanese while remaining recognizable in the other language when pronounced. The katakana transcription of a foreign name is how Japanese speakers will typically pronounce it in daily life.

Separate names for different registries

Some families give the child one name for the koseki (in kanji or kana, following Japanese rules) and the child's original foreign name on the foreign passport. The child goes by different names in different contexts. This is legally possible but can create practical complexity in international contexts, particularly as the child gets older and uses both sets of documents.

The "tsuushoumei" — a common-use name

In Japan, foreign nationals may register a common-use name (通称名, tsuushoumei) — a name used in daily life that differs from the legal name on the koseki or foreign passport. For children of foreign nationals who grow up in Japan, this can sometimes be a way to use a Japanese name day-to-day without it being the name on the foreign passport. Registering a tsuushoumei generally involves requirements such as demonstrating that the name is actually used in daily life, and the rules vary by municipality and circumstance; ask your local city office for details if this is relevant to your situation.

Thinking ahead: passports, school, and beyond

Consider how the name will appear across the key documents your child will use: the Japanese koseki or residence certificate (住民票, juuminhyou), the foreign passport, and eventually the Japanese passport if the child holds Japanese nationality. Consistency across documents simplifies travel and administrative processes. If the same sounds are rendered differently in each document, be prepared to explain this to authorities when traveling or enrolling in school.

6. Practical Steps: Name on the Birth Registration

The name you choose must be written on the shusshou todoke (birth registration form) before you submit it. Here is how the name section of the form works in general terms:

• The form has separate fields for the child's family name (sei) and given name (na / mei), both in kanji/kana characters.
• There is typically a furigana (reading) field above or next to each name field, where you write the phonetic reading in hiragana.
• The name must be finalized and written on the form at the time of submission. The city office checks the name field to confirm that the characters used are among the permitted types.

Deadline: For births in Japan, the shusshou todoke must be submitted within 14 days of the birth (counting the day of birth). The name must be decided within this window. (If the child is born outside Japan, a different deadline applies — see the birth registration guide.) Changing the name after this registration is submitted is not a simple administrative matter — it generally requires a family court (家庭裁判所, katei saibansho) procedure and the bar is set relatively high. Plan your name choice in advance.

For a full overview of the birth registration process — deadlines, required documents, and where to submit — see: Pregnancy & Birth in Japan: Step-by-Step Guide.

7. Pre-Registration Name Checklist

Before finalizing your baby's name and submitting the birth registration, consider working through the following points. This is a general checklist — not all items apply to every family situation.

• Koseki entry characters: If your child will be entered into the koseki, confirm that all kanji in the chosen name are on the jouyou kanji or jinmeiyou kanji list. Ask your city office if in doubt.
• Reading (furigana): Decide on the official reading of the name and be prepared to write it in hiragana on the form. Under the 2025 reform, this reading is now officially registered in the koseki — confirm with your city office how the reading field is handled.
• Foreign passport consistency: Check how the name will appear on the child's foreign passport (registered through the embassy). If the koseki name and passport name use different scripts, be prepared to carry both documents to explain the connection.
• Pronunciation in both languages: Say the name aloud in both languages (and in any other language the child will grow up using). Consider how it sounds to speakers of each language.
• Embassy registration: If the child has a foreign nationality, confirm with the home country's embassy how the name should be submitted for the foreign birth registration, and whether there are any restrictions on naming from that country's side.
• Middle name handling: If you plan to use a middle name, ask your city office explicitly how middle names are handled in the koseki registration before submitting.
• Name change difficulty: Remember that changing a Japanese registered name after submission requires a family court procedure. Make sure you are confident in the name before submitting the birth registration.

8. FAQ

Can I give my baby a Japanese kanji name even if neither parent is Japanese?

The character restrictions for koseki entries (jouyou kanji and jinmeiyou kanji) apply to children who are entered in the koseki — typically children who hold Japanese nationality through at least one Japanese parent. If both parents are foreign nationals and the child does not hold Japanese nationality, the child is not entered into the koseki as a Japanese national, so the koseki character rules do not apply in the same way. In practice, the name written on the Japanese administrative birth record for a foreign national child is often recorded in katakana. If you specifically want to use kanji in the name, confirm with your city office whether and how this is possible in your situation.

Can I use alphabet (Latin) letters in my baby's name on the birth registration?

For the koseki entry, Latin alphabet letters are not among the permitted character types. The name as it appears in the koseki must be in kanji (from the permitted lists), hiragana, or katakana. However, the name on your child's foreign passport — registered through your home country's embassy — follows your home country's rules and can use Latin letters. In this way, a child can have a Latin-script name on their foreign passport and a katakana rendering of the same name in the Japanese administrative record.

How does Japan handle middle names?

Japan's koseki system has a given name field (名) and a family name field (姓) but no separate middle name field. If your child has a middle name as part of their foreign name, it may be combined into the given name entry in the koseki, or it may not appear in the koseki at all. How this is handled in practice varies by city office. Ask your city office explicitly before submitting the birth registration. On the foreign passport, the child's full name — including any middle name — is handled according to your home country's passport rules.

Can we change the baby's name after submitting the birth registration?

In Japan, changing a name that has been entered in the koseki (or in an administrative birth record) after submission is not a simple process. It generally requires a petition to the family court (katei saibansho), and the court applies criteria such as the name causing genuine hardship or confusion. Routine or preference-based changes are not typically approved without a compelling reason. This underscores the importance of deciding on the name carefully before submitting the birth registration form.

Both of our parents are foreign nationals. How do we decide the baby's name?

If both parents are foreign nationals and the child does not hold Japanese nationality, the primary name that will appear on the child's identity documents is the name registered through your home country's embassy — following that country's naming rules. For the Japanese administrative record, many city offices record the child's name in katakana. There is no requirement to choose a Japanese-style name in this situation; you follow your home country's naming conventions. Check with both the city office (for the Japanese record) and the embassy (for the foreign nationality documentation) about what each requires.

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