同姓 どうせい Meanings Noun, の-adjective same surname Antonym: 異姓 (いせい). Kanji 同 same. Read as ドウ. 姓 surname. Read as セイ. Words containing 同姓 同姓同名 (どうせいどうめい) having the same family name and given name (as someone else) Jinuma: Japanese Dictionary · Word lists