All over the world, Реген (Regen 
, Roegen 
, Реген 
) is quite a rare epicene forename. The given name Реген is characteristic of Philippines, where it is quite a rare gender-neutral name, Hong Kong, where it is a rare girly name, and Indonesia, where it is a rare principally male, but very infrequently feminine name. In absolute terms, this name is the most popular in Philippines, Indonesia, and the United States. Likewise, Реген is the last name as well as the forename.