Family name Siday (Siday 
) , worldwide, is quite a rare cognomen. The family name Siday is habitual in India, where it is a rare surname, the United Kingdom, where it is a very rare surname, and Thailand, where it is an extremely rare surname. Much less frequently, Siday is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Siday | Ethiopia, United Kingdom, Thailand, Philippines, India |
| eric siday British-American musician (1905-1976), GB (b. 1905) |
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| r. e. siday British mathematician and physicist, GB (b. 1912) |
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| thomas siday researcher (ORCID 0000-0003-0157-3233) |
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