Around the world, Casto (Casto 
, Casta 
, Kasta ) is a common epicene given name. The forename Casto is habitual in Equatorial Guinea, where it is quite a common masculine name, Nicaragua, where it is quite a common gender-neutral name, and Bolivia, where it is quite a rare unisex name. Not in comparison with a country's population, this name is the most popular in Tanzania, Mexico, and India. Also, Casto is the last name as well as the forename.