Surname Sälg (Selja 
, Sälg 
) , in all the world, is a very rare last name. The family name Sälg is habitual in North Macedonia, where it is a rare surname, Sweden, and Finland, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in Sweden, North Macedonia, and the United States. More frequently, Sälg is the forename as well as the last name.