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Across the world, スミオ (スミオ ) is an extremely rare unknown gender first name. More frequently, スミオ is the last name as well as the forename.
Smio, Sumio, Сумио, 澄夫, 澄生, and 澄雄
ノダ, アサノ, イクタ, シバタ, コモリ, オオモリ, クロカワ, タカハシ, and サクライ