In all the world, Siwas (ศิวา 
, ศิวัสว์ , Siwas 
) is a rare principally masculine, but very infrequently feminine forename. The first name Siwas is characteristic of Thailand, where it is a rare primarily male, but scarcely girly name, and India, where it is an extremely rare gender-neutral name. Much less frequently, Siwas is the last name as well as the forename.