Family name Сига (Siga 
, Shiga 
, Syga 
) , in the entire world, is a common last name. The surname Сига is characteristic of Fiji, where it is quite a common surname, Guinea-Bissau, where it is quite a rare surname, and Latvia. In absolute terms, the name is most common in India, Indonesia, and Philippines. Likewise, Сига is the forename as well as the last name.