Save Type Surname (from location) Usage Japanese Scripts 大城(Japanese Kanji) おおしろ(Japanese Hiragana) Pronounced Pron. /o̞ː.ɕi.ɾo̞/ [key·simplify] Meaning & History From Japanese 大 (ō) meaning "big, great" and 城 (shiro) meaning "castle". It is especially common on Okinawa. Related Names Rootsō + shiro Categories sizes