Family name ส้มแป้น (Sompaen 
, Somfai 
, ส้มแป้น) , in the entire world, is quite a rare cognomen. The family name ส้มแป้น is characteristic of Hungary, where it is quite a rare surname, Thailand, where it is a rare surname, and Norway, where it is a very rare surname. Measured by absolute frequency, the name is most common in Hungary, Thailand, and Germany. Much less frequently, ส้มแป้น is the forename as well as the last name.