Globally, Tomoo (Tomoo 
, トモオ , تومو 
) is a rare male forename. The first name Tomoo is habitual in Eastern Asia, particularly Japan, where it is a very rare male name, and China, where it is an extremely rare masculine name. More prevalently, Tomoo is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Tomoo | Brazil, Japan, Taiwan, United States, China |
| トモオ | Japan |
| تومو | Iraq |
| Томоо | Ukraine |
| otaguro tomoo Leader of a rebellion (b. 1836) |
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| tomoo inagaki Japanese artist (1902–1980), JP (b. 1902) |
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| tomoo handa Brazilian painter (1906-1996), BR (b. 1906) |
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| tomoo fujimori (b. 1898) |
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| tomoo hososako (b. 1921) |
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| tomoo kondō (b. 1935) |
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| tomoo ryūshi (b. 1951) |
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| tomoo sato researcher |
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| tomoo katsura researcher |
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| tomoo sigehuzi researcher |
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| tomoo hirano researcher |
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| tomoo kawamura researcher (ORCID 0000-0002-0528-1206) |
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| tomoo hosoe researcher |
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| tomoo inoue Ph.D. University of California, San Diego 1997 |
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| tomoo hidaka researcher |
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