Surname Katsumasa (Katsumasa 
, Кацумаса 
) , globally, is quite a rare family name. The family name Katsumasa is habitual in Eastern Asia, particularly Japan, where it is quite a rare surname, Taiwan, where it is a rare surname, and China, where it is an extremely rare surname. Very seldom, Katsumasa is the forename as well as the last name.