Family name Tomokiyo (Tomokiyo 
, Оямада 
) , globally, is a very rare last name. The surname Tomokiyo is habitual in the United States, where it is a very rare surname, Russia, where it is an extremely rare surname, and Brazil. Much more prevalently, Tomokiyo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tomokiyo | United States, Japan, Brazil, China |
| Оямада | Russia |
| ōtawara tomokiyo daimyo of the mid-Edo period. 8th lord of Ōtawara (b. 1720) |
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| atsushi tomokiyo researcher (ORCID 0000-0002-1638-4008) |
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