In all the world, Sadayasu (Sadayasu 
, Огасавара 
) is an extremely rare unknown gender first name. Much more prevalently, Sadayasu is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Sadayasu | Singapore, China, United States |
| Огасавара | Russia |
| arakawa sadayasu (b. 1599) |
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| matsudaira sadayasu [松平定休] Daimyo of Imabari (b. 1752) |
|
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| nitta sadayasu (b. 1785) |
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|
makino sadayasu (b. 1857) |
|
| ogasawara sadayasu (b. 1831) |
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| nitta sadayasu (b. 1850) |
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