Across the world, Tadayuki (Tadayuki 
, Тадаюки 
) is a rare male first name. The forename Tadayuki is characteristic of Japan, where it is a very rare male name, the United States, where it is an extremely rare boy's name, and China. Likewise, Tadayuki is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Tadayuki | Brazil, Japan, Philippines, China, United States |
| Тадаюки | Russia |
| shimazu tadayuki (b. 1550) |
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| tadayuki kuroda (b. 1602) |
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| matsudaira tadayuki [松平忠之] daimyo of the middle Edo period; 2nd lord of Koga (b. 1674) |
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matsudaira tadayuki [松平忠恕] daimyo of the late Edo period; 4th (last) lord of Obata (b. 1825) |
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| shimazu tadayuki (b. 1797) |
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honnda tadayuki (b. 1858) |
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| toda tadayuki (b. 1809) |
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| tadayuki ozaki (b. 1810) |
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| tadayuki tsunoda 19th century Japanese priest (b. 1834) |
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| shimazu tadayuki (b. 1832) |
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| aoyama tadayuki (b. 1834) |
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| toda tadayuki (b. 1847) |
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| toda tadayuki (b. 1847) |
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| tadayuki okamoto baseball player (-1948) (b. 1925) |
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| tadayuki kawahito Japanese photographer (b. 1947) |
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