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Worldwide, Siy (Sella , Silla , Siy ) is a common mostly feminine, but infrequently male first name. The first name Siy is habitual in Indonesia, where it is quite a rare largely feminine, but seldom masculine name, Tanzania, where it is quite a rare epicene name, and Qatar. Not in comparison with a country's population, it is commonest in Indonesia, India, and Tanzania. Likewise, Siy is the last name as well as the forename.
Siy is also a name for the fictitious and mythical characters: Silla , the operatic character in the opera Palestrina by Hans Pfitzner; Giovanni's pupil.