Cognomen Omatsu (Omatsu 
) , worldwide, is a rare last name. The cognomen Omatsu is characteristic of Estonia, where it is a rare surname, Argentina, where it is a very rare surname, and Canada. Not in comparison with a country's population, it most frequently occurs in Brazil, the United States, and China. More prevalently, Omatsu is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Omatsu | Japan, China, Argentina, Brazil, United States |
| cindy omatsu American martial artist, US (b. 1961) |
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| kohei omatsu researcher |
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| maryka omatsu Japanese-Canadian artist |
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| terumasa omatsu researcher (ORCID 0000-0001-6358-5593) |
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| tatsushi omatsu researcher (ORCID 0000-0001-9823-5809) |
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