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Family name 国氏 (国氏 ) , all over the world, is an extremely rare last name. Much more frequently, 国氏 is the forename as well as the last name.
Cook, Gook, Gug, Guk, Guo, Guó, Kok, Kook, Kug, Kuk, Кук, クク, 国, 國, 菊, 鞠, and 국