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I won't profess to be 100% certain, but I am almost positive that according to Japanese law, Japanese-Japanese marriages force the woman to take the man's name and be put on his ナ津仰静 (koseki - family register) which the kids would take too. The exception is Japanese-foreign marriages in which case the foreigner doesn't have a koseki, can keep his/her last name, and God only knows what the rule is regarding the children (they can probably adopt either or both names when they register the birth in Japan).