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In the world, 세인 (Sein
, 세인
) is a common dominantly boy's, but seldom feminine forename. The given name 세인 is habitual in Mongolia, where it is a common primarily masculine, but very infrequently girly name, South Korea, where it is quite a rare gender-neutral name, and Myanmar, where it is quite a rare dominantly boy's, but uncommonly feminine name. Likewise, 세인 is the last name as well as the forename.
세인 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).