Across the world, Petko (Петко 
, Petko 
, Петько 
, and others...) is a common masculine first name. The first name Petko is characteristic of Bulgaria, where it is a widespread male name, Antigua and Barbuda, where it is quite a common masculine name, and North Macedonia, where it is quite a rare boy's name. Measured by absolute frequency, it is the most numerous in Bulgaria, Greece, and Romania. Likewise, Petko is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Петко | Kazakhstan, Russia, Belarus, Bulgaria, Ukraine |
| Petko | North Macedonia, Serbia, Bulgaria, United States, Slovakia |
| Петько | Kazakhstan, Russia, Kyrgyzstan, Belarus, Ukraine |
| פטקו | Israel |
Kepa, Peder, Pedro, Pedru, Peer, Peeter, Peetu, Pehr, Per, Pere, Pero, Peru, Pet'Ko, Petar, Petelo, Peter, Peters, Petkó, Petr, Petri, Petro, Petros, Petru, Petrus, Petter, Petteri, Petur, Petyr, Peťko, Piero, Pierre, Piet, Pietari, Pieter, Pietro, Piotr, Piters, Pjeter, Pjetur, Pjetër, Père, Péter, Pétur, Pēteris, Πέτρος, Πέτρου, Πετρος, П'Ер, П'Єр, Педер,
| petko vasiljević Major in First Serbian Uprising (b. 1780) |
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petko ilić MK (b. 1886) |
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| petko petrov arnaudov Bulgarian Esperantist, BG (b. 1931) |
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| petko pantaleev Bulgarian volleyball player (b. 1939) |
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| petko mihaylov ogoyski (b. 1929) |
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| petko domazetovski (b. 1935) |
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| petko atanasov chess player (b. 1948) |
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| petko dabeski (b. 1939) |
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| petko marinov basketball player and coach (b. 1949) |
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| petko vojnić purčar (b. 1939) |
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| petko kichev Bulgarian archer (b. 1950) |
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| petko chobanov president of Burgas Free University (b. 1956) |
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| petko hristov petkov (b. 1948) |
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| petko nikolić viduša RS (b. 1951) |
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| petko manchev composer (b. 1964) |
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