Surname Sasayama (Sasayama 
) , around the world, is a rare cognomen. The last name Sasayama is characteristic of Singapore, where it is a very rare surname, Japan, and Indonesia. Measured by absolute frequency, it most frequently occurs in Japan, Indonesia, and the United States. Likewise, Sasayama is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Sasayama | Malaysia, Japan, China, United States, Indonesia |
| sasayama tokuoki (b. 1813) |
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| sasayama tokuhiro Japanese swordsmith (1831-1871) (b. 1831) |
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| tadayasu sasayama (b. 1939) |
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| kensaku sasayama researcher (ORCID 0000-0001-7474-9960) |
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| daimei sasayama researcher |
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| takashi sasayama researcher (ORCID 0000-0002-5593-9045) |
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| nozomi sasayama (b. 1977) |
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| naoki sasayama JP (b. 1981) |
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