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All around the world, Sai' (Sein , Sīn , Sai' ) is a common largely masculine, but uncommonly female forename. The forename Sai' is characteristic of Mongolia, where it is a common principally male, but very infrequently girly name, Myanmar, where it is quite a rare dominantly boy's, but uncommonly feminine name, and South Korea, where it is quite a rare epicene name. Likewise, Sai' is the last name as well as the forename.
Sai' 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).