Last name Olsa (Olsa 
) , all over the world, is a rare family name. The cognomen Olsa is habitual in Eastern Europe, particularly Slovakia, where it is quite a rare surname, Czechia, and Hungary, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in Slovakia, Czechia, and Indonesia. Likewise, Olsa is the forename as well as the last name.