Cognomen Siwawat (Siwawat 
) , across the world, is an extremely rare surname. The last name Siwawat is characteristic of Northern America, particularly the United States, where it is an extremely rare surname. Much more prevalently, Siwawat is the forename as well as the last name.
Numkliang, Maneerat, Peerapat, Samanchat, Pradujpol, Potisoontorn, Sawangwong, Chanprasart, Kheereekaew, Kiatsuphawong, and Wichiansri