Family name Masutomi (Masutomi 
) , in the entire world, is a very rare cognomen. The family name Masutomi is characteristic of Thailand, where it is an extremely rare surname, the United States, and Philippines. More frequently, Masutomi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Masutomi | Japan, Thailand, United States, Philippines |
| shoichi masutomi Japanese freestyle wrestler (b. 1912) |
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| yuji masutomi researcher |
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| kenkichi masutomi researcher (ORCID 0000-0002-6739-4257) |
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