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In page Demographics of Japan:

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In addition, people taking Japanese citizenship must take a name using one or more of the Japanese character sets (hiragana, katakana, kanji). Names written in the Western alphabet, Korean alphabet, Arabic characters, etc., are not acceptable as legal names. Chinese characters are usually legally acceptable as nearly all Chinese characters are recognized as valid by the Japanese government. Transliterations of non-Japanese names using katakana (e.g. スミス "Sumisu" for "Smith") are also legally acceptable.[citation needed]