Family name Сайко (Saiko 
, Sayko 
, Сайко 
) , across the world, is a common cognomen. The cognomen Сайко is habitual in Belarus, where it is quite a common surname, Ukraine, where it is quite a rare surname, and Egypt. Not in comparison with a country's population, it is the most numerous in Ukraine, Egypt, and Russia. Much less frequently, Сайко is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Saiko | Tanzania, Egypt, Indonesia, Myanmar, Germany |
| Sayko | Indonesia, United States, Russia, Egypt, India |
| Сайко | Bulgaria, Russia, Kazakhstan, Ukraine, Belarus |
| сайко микола пилипович Ukrainian specialist in literature, poet and translator (1897-1949), UA (b. 1897) |
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| сайко андрій трохимович UA (b. 1918) |
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| сайко, эди викторовна RU (b. 1932) |
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| сайко, виктор фёдорович UA (b. 1936) |
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| наталья сайко Soviet and Russian actress, RU (b. 1948) |
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| аляксандр аляксеевіч сайко BY (b. 1951) |
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| сайко людмила михайлівна UA (b. 1951) |
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| сайко, елена валентиновна athletics competitor, RU (b. 1967) |
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