Cognomen Petcu (Петко 
, Petcu 
, Петку ) , around the globe, is a common family name. The cognomen Petcu is characteristic of Eastern Europe, particularly Bulgaria, where it is a common surname, Romania, where it is quite a common surname, and Moldova. Likewise, Petcu is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Петко | Kazakhstan, Russia, Belarus, Bulgaria, Ukraine |
| Petcu | Romania, Italy, Spain, Moldova, Afghanistan |
| Петку | Russia, Ukraine |
| Петцу | Russia |
| petcu soanul (b. 1706) |
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| george petcu RO (b. 1917) |
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| remus petcu (b. 1935) |
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| florica petcu Romanian rower, RO (b. 1951) |
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| ștefan petcu Romanian footballer, RO (b. 1957) |
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| ioan petcu Romanian association football player, RO (b. 1959) |
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| adriana petcu Romanian politician, RO (b. 1961) |
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| marian petcu Romanian author (b. 1961) |
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| dana petcu Romanian mathematician (1966-), RO (b. 1966) |
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| răzvan petcu Romanian swimmer, RO (b. 1973) |
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| sorin petcu Romanian canoeist, RO (b. 1974) |
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| florin petcu Romanian footballer, RO (b. 1976) |
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| florin lucian petcu Romanian association football player, RO (b. 1976) |
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| toma-florin petcu Romanian politician, RO (b. 1978) |
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| cristian petcu researcher, RO |
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