Surname Masaharu (Masaharu 
, マサハル , Масахару 
) , worldwide, is a common family name. The surname Masaharu is habitual in Japan, where it is quite a common surname, Hungary, where it is a rare surname, and Poland, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in Japan, China, and Indonesia. Very seldom, Masaharu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Masaharu | Brazil, India, Japan, United States, China |
| マサハル | Japan |
| Масахару | Russia, Ukraine |
| naitō masaharu daimyo of the early-Edo period; 1st lord of Mutsu-Izumi (b. 1626) |
|