Submitting a change-of-surname certificate to Japan — how must it be translated and certified?

What the enquirer needs to know is “Submitting a change-of-surname certificate to Japan”, so the answer below starts with what this case actually needs before setting out the general rules. Romanised spelling follows the passport so the destination office does not read two different people. Cross-border service of process must go through the judicial cooperation channel. Before starting, make sure document numbers, issue dates and issuing-office names match across the set, then keep a digital copy of every page, including seals and signatures, then plan the timeline so certification finishes before the real filing deadline. The point to fix before starting is the real deadline, so the steps can be scheduled backwards from it. The biggest risk in cases like this is doing the certification steps out of order, which forces a restart. The terms that frame this page are Submitting · change-of-surname · certificate · Japan. The specifics here are document type: Surnamechange; destination: Jp, and those decide which translation and certification level applies. If the issuing district office has been merged, obtain a clarification letter from the successor office. Litigation powers of attorney must list the granted powers item by item. Note who signed each certification and on what date for later reference. Record the reference number of each certification layer; it is the fastest way to trace status. With a fixed filing date, count backwards from it and book each certification step in reverse. Public holidays and embassy closures move certification queues more than most people expect. If any requirement is still unclear, send a sample image to the receiving body before producing the full set. A Thai civil registration document for overseas use is normally translated into the language the destination requires, then legalised by the Legalisation Division, Department of Consular Affairs, Ministry of Foreign Affairs, and where required further legalised by the destination country's embassy or consulate. Most receiving authorities want a registrar-certified copy of the register rather than a photocopy made by the holder, because the certified copy carries the registrar's signature and seal that the Ministry of Foreign Affairs can verify; obtain a freshly issued certified copy before starting the translation and legalisation steps. Thailand deposited its instrument of accession to the Hague Apostille Convention on 30 June 2026, but the Convention is not yet in force for Thailand, so consular legalisation through the Ministry of Foreign Affairs and the relevant embassy remains the working route; confirm the current requirement with the receiving authority before filing. Cost and lead time depend on the number of documents, the language pair and the certification steps the receiving authority requires, so every file is quoted before work starts. Send a scan of the documents together with the receiving authority's own instructions via LINE @NAATI, call +66 80-557-8887 or email ilc@thainotary.co.th.

ปรึกษาฟรี — LINE @NAATI · โทร 080-5578887 · อีเมล ilc@thainotary.co.th