Across the world, Sadayuki (Sadayuki 
) is a very rare masculine first name. The first name Sadayuki is characteristic of Eastern Asia, particularly Japan, where it is a very rare male name, and China, where it is an extremely rare masculine name. More frequently, Sadayuki is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Sadayuki | Japan, China, Singapore, United States, Brazil |
| matsudaira sadayuki (b. 1587) |
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| sadayuki muragaki (b. 1762) |
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| sadayuki murashima (b. 1942) |
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| sadayuki yamamuro Ph.D. |
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| sadayuki ono Ph.D. University of Virginia 2004 |
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| sadayuki kawai researcher |
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| sadayuki hashioka researcher |
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| sadayuki matsumoto |
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| sadayuki morita |
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