Family name 徳山 (Tokuyama 
, 徳山 ) , globally, is a rare surname. The family name 徳山 is characteristic of Japan, where it is a rare surname, New Zealand, and Canada, where it is a very rare surname. In absolute terms, it is the most numerous in Japan, the United States, and Brazil. Likewise, 徳山 is the forename as well as the last name.