In all the world, Ися (Isya 
, Isia 
, Isja 
) is quite a common unisex first name. The first name Ися is characteristic of Nigeria, where it is quite a rare predominantly masculine, but very seldom feminine name, Puerto Rico, where it is quite a rare girly name, and Indonesia, where it is a rare epicene name. Measured by absolute frequency, the name is most common in Nigeria, Indonesia, and India. Likewise, Ися is the last name as well as the forename.