In all the world, Tadamasa (Tadamasa 
, Тадамаса 
) is a very rare dominantly masculine, but seldom girly forename. More prevalently, Tadamasa is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Tadamasa | Japan, China, Georgia, United States, Brazil |
| Тадамаса | Russia |
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fujiwara no tadamasa (b. 1124) |
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shimazu tadamasa [島津忠昌] daimyo of the late Muromachi period (b. 1463) |
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mori tadamasa (1570-1634) (b. 1570) |
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| shimazu tadamasa [島津忠将] samurai of the Sengoku period (b. 1520) |
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sengoku tadamasa (b. 1578) |
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| matsudaira tadamasa [松平忠正] head of Sakurai Matsudaira clan in the Sengoku period (b. 1543) |
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| yonekitsu tadamasa (b. 1563) |
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| ōsuka tadamasa (b. 1581) |
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| naitō tadamasa (b. 1615) |
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matsudaira tadamasa daimyo of the mid Edo period (1683-1746) (b. 1683) |
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| shimazu tadamasa [島津忠雅] daimyo of Sadowara (b. 1703) |
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| matsudaira tadamasa [松平忠祇] daimyo of the middle to late Edo period; 5th lord of Shimabara, 1st lord of Utsunomiya (b. 1738) |
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| matsudaira tadamasa [松平忠済] daimyo of the middle to late Edo period; 4th lord of Ueda (b. 1751) |
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suwa tadamasa (b. 1821) |
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| ueno tadamasa (1904-1970) (b. 1940) |
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