Family name Umoto (Umoto 
) , globally, is a rare surname. The family name Umoto is habitual in Japan, where it is a rare surname, Cambodia, where it is a very rare surname, and the United States, where it is an extremely rare surname. In absolute terms, it is the most numerous in Japan, China, and the United States. Much less frequently, Umoto is the forename as well as the last name.