Family name Šago (Шаго 
, Šago 
) , throughout the world, is a rare cognomen. The cognomen Šago is habitual in Croatia, where it is quite a rare surname, Russia, where it is a rare surname, and Belarus, where it is a very rare surname. Measured by absolute frequency, it is commonest in Russia, Croatia, and Ukraine. Very seldom, Šago is the forename as well as the last name.