Cognomen Yantsu (Yantsu , Ианцу ) , all over the world, is an extremely rare family name. Much more frequently, Yantsu is the forename as well as the last name.
Янцу
Lotha
, Ианцу 
) , all over the world, is an extremely rare family name. Much more frequently, Yantsu is the forename as well as the last name.