Cognomen Sikó (Sikó 
) , worldwide, is a very rare family name. The family name Sikó is characteristic of Eastern Europe, particularly Hungary, where it is a rare surname. Very seldom, Sikó is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Sikó | Hungary |
| jános sikó RO (b. 1628) |
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miklós sikó painter (1818-1900), RO (b. 1818) |
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| nikolaus sikó (b. 1820) |
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| sikó attila Hungarian hydraulic engineer, HU (b. 1897) |
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| lászló sikó Romanian veterinarian, RO (b. 1941) |
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| imre sikó Romanian politician from Belin, Covasna County, RO |
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