Family name Ючас (Jucas 
, Ючас 
) , in the entire world, is a rare cognomen. The surname Ючас is characteristic of Lithuania, where it is quite a rare surname, Belarus, where it is a rare surname, and Brazil, where it is a very rare surname. In absolute terms, it is the most numerous in Lithuania, Brazil, and the United States. More frequently, Ючас is the forename as well as the last name.