・ 音 セイ,ショウ
Sino-Vietnamese: tính
Woman 女 beside 生 (birth): the family name passed on from the mother who gave birth. Sino-Vietnamese tính, as in tính danh (full name).
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日本人の姓で一番多いのは佐藤です。 (にほんじんのせいでいちばんおおいのはさとうです)
The most common Japanese surname is Sato.