Cognomen Sanwan (Sanwan 
, 三湾 
, สันวรรณ ) , in the entire world, is a rare surname. The cognomen Sanwan is characteristic of South-eastern Asia, particularly Singapore, where it is a rare surname, Malaysia, and Thailand. In absolute terms, it most frequently occurs in South-eastern Asia, particularly Malaysia, Thailand, and Indonesia. Likewise, Sanwan is the forename as well as the last name.