All around the world, Ysai (Ysai 
) is a rare principally masculine, but scarcely female first name. The first name Ysai is habitual in Peru, where it is a rare masculine name, Mexico, where it is a very rare male name, and India, where it is an extremely rare dominantly masculine, but seldom female name. Likewise, Ysai is the last name as well as the forename.