All around the world, Сийка (Сийка 
, Sijka 
, Siyka 
) is quite a common female first name. The first name Сийка is characteristic of Bulgaria, where it is quite a common female name, North Macedonia, where it is quite a rare female name, and Greece, where it is a rare feminine name. Also, Сийка is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Сийка | Ukraine, Bulgaria |
| Sijka | Czechia, North Macedonia, Bulgaria, Poland, Slovakia |
| Siyka | Italy, United States, Bulgaria, Greece, Brazil |
| сийка цончева Bulgarian military pilot, BG (b. 1926) |
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| сийка атанасова BG (b. 1928) |
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| сийка барбулова Bulgarian rower, BG (b. 1951) |
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