Surname つとむ (Tsutomu 
, つとむ) , in the entire world, is quite a common last name. The last name つとむ is habitual in Japan, where it is quite a rare surname, Hong Kong, where it is a rare surname, and Singapore. In absolute terms, this name is the most popular in Japan, China, and Indonesia. Also, つとむ is the forename as well as the last name.