Last name Mansin (Mansin 
, มั่นสิน) , around the world, is a rare family name. The family name Mansin is characteristic of South-eastern Asia, particularly Malaysia, where it is a rare surname, Thailand, where it is a very rare surname, and Philippines. In absolute terms, it is commonest in Malaysia, Thailand, and Brazil. Likewise, Mansin is the forename as well as the last name.