When a Japanese Koseki Names a Foreign Spouse Only in Katakana

What We Received

A client submitted a Japanese Koseki Tohon — specifically, a Koseki Zenbu Jikō Shōmeisho (戸籍全部事項証明書, "Certification of All Matters Recorded in the Family Register") — issued by a municipality in Saitama Prefecture. The register covers the head of household, his two sequential marriages, and his children, including one son who later married a Filipino woman and started his own register.

All three foreign spouses in the document — the head of household's first and second wives (both Filipino), and his eldest son's wife (Filipino) — appear in the register exclusively in Japanese katakana: the phonetic script that Japanese uses for non-Japanese words. Example katakana strings include "キュウロンサパララン, ピンキロース" and "グティエレズミア, リーダミリアム." Nowhere on the document is there a Latin-script spelling of any of these names.

The certified English translation was needed for a USCIS family-petition (I-130) filing — see our [certified koseki tohon translation](/documents/koseki-tohon) and [Japanese translation services](/languages/japanese) pages.

How We Handled It

We worked the case in two passes. First, we produced a phonetic transliteration of each katakana name in "SURNAME, GIVEN NAME" format, matching how the original koseki places the comma, and used that exact spelling consistently across every occurrence in the register (the head of household's first wife appears a second and third time as the mother of two children — we rendered her identically in all three places).

We delivered the draft with a Translator's Note flagging that the Latin spellings were phonetic reconstructions and asking the client to verify them against each spouse's identification. The client returned the spellings from each spouse's ID — "Quilon Sapalaran, Pinky Rose," "Balacanta Neri, Cora," and "Gutierrez Mia, Lydda Miryam" — and we re-issued the certified translation using the client-verified forms.

For the client's own name (礼一郎), we used "Reiichiro" as supplied at order placement. Other Japanese names use Hepburn romanization without macrons, matching that style. Japanese era dates were converted to Gregorian with the era kept in parentheses ("March 9, 2002 (Heisei 14)"). Japanese addresses were rendered in Latin-script small-to-large order per standard certified-translation practice, disclosed in a Translator's Note.

The final Translator's Note on the foreign names reads:

Expert Note

"The names of the foreign (Filipino) spouses and the mother of the children are recorded in the original in Japanese katakana only; no Latin-script spelling appears anywhere on the document itself. The Latin-script spellings used in this translation were provided by the document holder based on the spouses' own identification documents, and correspond to the following katakana readings on the original: キュウロンサパララン, ピンキロース = Quilon Sapalaran, Pinky Rose; バラカンタネリ, コラ = Balacanta Neri, Cora; グティエレズミア, リーダミリアム = Gutierrez Mia, Lydda Miryam."

Wei LinTechnical & Business Translation Lead

This note does three things. It tells the USCIS adjudicator that the Latin spellings are not a transcription of anything that appeared on the original — the original had only katakana. It identifies the holder's own review of the spouses' IDs as the source of the Latin forms. And it lists the katakana each spelling corresponds to, so any reviewer can verify the mapping independently.

Two additional Translator's Notes covered the era-to-Gregorian date conversion and the Japanese-to-Latin address-order conversion. The "Retention of Nationality" (国籍留保) and "Choice of Nationality" (国籍選択) declarations filed by the Philippine-born children were rendered in full, with the Japanese Embassy in Manila identified as receiving authority. The 除籍 ("Removed from Register") marker on the eldest son — added when his marriage started a new family register — was reproduced with a bracketed translator's gloss.

The Outcome

The certified translation was delivered to the client for inclusion in their USCIS I-130 family-petition packet. The Translator's Note framing the foreign-spouse names as phonetic reconstructions — rather than authoritative Latin spellings — gives the adjudicator the full context needed to reconcile any spelling difference against the spouses' passports without raising a Request for Evidence against the translation itself.

This is the first case in our log involving a Japanese koseki where every foreign spouse — three of them — was recorded only in katakana. The pattern is common for Japanese citizens whose spouses registered a marriage under Philippine or other foreign law rather than at a Japanese city hall, so we expect to handle more cases of this kind as Japanese-Filipino and similar mixed-nationality couples file family petitions.