Cognomen Sonča (Sonča 
) , in the world, is an extremely rare last name. Much more frequently, Sonča is the forename as well as the last name.
Fexová, Dovčiaková, Gwozdzová, Šmídová, Matýsková, Benešová, Blažková, Kvasničáková, Tomanová, Nazarevičová, and Dvořáčková