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Cognomen Syoi (Syoi ) , across the world, is an extremely rare last name. Much more prevalently, Syoi is the forename as well as the last name.
Ii, Ikii, Ikui, Kii, Namai, Nasui, Oi, Seii, Shohi, Shoi, Shoui, Syoui, Ubui, Ui, Umai, Šói, うい, and 生井