Family name Сяга (Siaga 
, Syaga 
, Сяга 
) , in all the world, is quite a rare cognomen. The last name Сяга is habitual in Cameroon, where it is quite a rare surname, Tanzania, and Philippines, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Philippines, Indonesia, and Tanzania. Very seldom, Сяга is the forename as well as the last name.