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In the entire world, סיין (Sein , סיין ) is a common dominantly boy's, but infrequently feminine forename. The forename סיין is habitual in Mongolia, where it is a common predominantly masculine, but scarcely feminine name, Myanmar, where it is quite a rare mostly masculine, but infrequently girly name, and South Korea, where it is quite a rare unisex name. Likewise, סיין is the last name as well as the forename.
סיין is also a name for the fictitious and mythical characters: sein Vetter , the operatic character in the operetta Abschiedswalzer; Sein Sekretär , the operatic character in the opera Der junge Lord; Sein Jünger , the operatic character in the opera Der Golem and Sein Schneidermeister , the operatic character in the opera Kleider machen Leute (Zemlinsky).