In the entire world, Jansak (เจนศักดิ์ 
, Jansak 
, จันทร์ศักดิ์ ) is a rare predominantly boy's, but very infrequently female forename. The first name Jansak is characteristic of South-eastern Asia, particularly Thailand, where it is a rare principally male, but very seldom feminine name. Likewise, Jansak is the last name as well as the forename.