Last name Masaru (Masaru 
, マサル , Масару 
) , in the world, is a common cognomen. The surname Masaru is characteristic of Japan, where it is quite a common surname, Israel, where it is quite a rare surname, and Romania, where it is a rare surname. In absolute terms, this name is the most popular in Japan, China, and India. Much less frequently, Masaru is the forename as well as the last name.