Last name Sonca (Sonca 
, Сонца 
) , all over the world, is a rare cognomen. The family name Sonca is habitual in Romania, where it is a rare surname, Belarus, where it is a very rare surname, and Argentina. Not in comparison with a country's population, it most frequently occurs in Romania, Argentina, and Vietnam. Much less frequently, Sonca is the forename as well as the last name.