Around the world, Петко (Петко 
, Petko 
, Petcu 
) is a common boy's given name. The forename Петко is habitual in Bulgaria, where it is a widespread boy's name, Antigua and Barbuda, where it is quite a common boy's name, and Romania, where it is quite a rare unisex name. Not in comparison with a country's population, the name is most common in Bulgaria, Romania, and Greece. Also, Петко is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Петко | Russia, Bulgaria, Belarus, Kazakhstan, Ukraine |
| Petko | Slovakia, North Macedonia, Bulgaria, Romania, United States |
| Petcu | Romania, Afghanistan, Moldova, United States, Italy |
Kepa, Peder, Pedro, Pedru, Peer, Peeter, Peetu, Pehr, Per, Pere, Pero, Peru, Petar, Petelo, Peter, Peters, Petr, Petri, Petro, Petros, Petru, Petrus, Petter, Petteri, Petur, Petyr, Piero, Pierre, Piet, Pietari, Pieter, Pietro, Piotr, Piters, Pjeter, Pjetur, Pjetër, Péter, Pétur, Pēteris, Πέτρος, Πέτρου, Πετρος, П'Ер, П'Єр, Педер, Педро, Педру, Пеер, Пер,
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петко славейков Bulgarian journalist (1827-1895), BG (b. 1827) |
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петко каравелов Bulgarian politician (1843-1903), BG (b. 1843) |
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петко войвода Bulgarian revolutionary (1844-1900), BG (b. 1844) |
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| петко доганов BG (b. 1802) |
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петко франгов BG (b. 1855) |
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петко клисуров painter (1865-1933), BG (b. 1865) |
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петко цъклев BG (b. 1863) |
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петко тодоров Bulgarian writer, poet and playwright, BG (b. 1879) |
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петко росен Bulgarian author, BG (b. 1880) |
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| петко мачев BG (b. 1820) |
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| петко петков BG (b. 1827) |
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| петко боянин BG (b. 1828) |
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петко енев Bulgarian lawyer, BG (b. 1889) |
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петко наумов BG (b. 1879) |
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петко напетов BG (b. 1880) |
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