Family name Masateru (Masateru 
) , in the world, is a rare cognomen. The last name Masateru is habitual in Taiwan, where it is a rare surname, Japan, and Malaysia, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in Eastern Asia, particularly Japan, Taiwan, and China. Very seldom, Masateru is the forename as well as the last name.