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Cognomen クワジマ (クワジマ ) , globally, is an extremely rare last name. Much more frequently, クワジマ is the forename as well as the last name.
Kuwajima, and Kwajima
ユウ, カズミ, ガクト, ハルカ, ヒロシ, ユウコ, マサユキ, and ヒロアキ