Family name Kulsa (Kulsa 
, กุลสา ) , throughout the world, is a rare cognomen. The surname Kulsa is habitual in Latvia, where it is quite a rare surname, Thailand, where it is a rare surname, and Malaysia, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in Thailand, the United States, and Latvia. Likewise, Kulsa is the forename as well as the last name.