Last name Томоя (Tomoya 
, Томоя 
, Tomoia ) , globally, is a rare cognomen. The surname Томоя is habitual in Japan, where it is a rare surname, Indonesia, where it is a very rare surname, and Malaysia. Not in comparison with a country's population, it is the most numerous in China, Japan, and Indonesia. More frequently, Томоя is the forename as well as the last name.