Cognomen Pietro (Pietro 
, بيترو 
, Пиетро 
, and others...) , in the entire world, is a common last name. The surname Pietro is habitual in San Marino, where it is a common surname, Italy, where it is quite a common surname, and Switzerland, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Italy, Brazil, and the United States. Much more prevalently, Pietro is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Pietro | Germany, France, Italy, Brazil, United States |
| بيترو | Libya, Jordan, Iraq, Palestinian Territory |
| Пиетро, Пьетро | Russia |
| פייטרו | Israel |
Bedros, Dipietro, Kepa, Peder, Pedro, Pedru, Peer, Peeter, Peetu, Pehr, Per, Pere, Pero, Peru, Petar, Petelo, Peter, Peters, Petko, Petr, Petrarca, Petras, Petri, Petrilli, Petro, Petros, Petru, Petrus, Petruzzelli, Petter, Petteri, Petur, Piatro, Piero, Pierre, Piet, Pietari, Pieter, Pietra, Pietrini, Pietrò, Piotr, Piters, Piètro, Piétro, Piêtro, Piëtro, Pjeter, Pjetur, Pjetër, Pjotr, Pyotr, Pyè, Père, Péter, Pétur, Pêr, Pēteris, Sampietro, São Pedro, Πέτρα, Πέτρος, Πέτρου, Πετρος, П'Ер, П'Єр, П'Єтро, Педер, Педро, Педру, Пеер, Пер, Пере, Перо, Перу, Петар, Петер, Петерис, Петеріс, Петко, Петр, Петрас, Петри, Петро, Петрос, Петру, Петрус, Петтер, Петтери, Пету, Петур, Петър, Петя, Пеэтер, Пит, Питер, Питер, Петер, Пйотр, Пьер, Пьеро, Пьотр, Пьотър, Пьєтро, Пэтэр, Пятрас, Пятро, Пётар, Пётр, Пєтро, Піетро, Пітер, פאר, פדרו, פטר, פטרו, פטרוס, פטרי, פיטר, פייר, פר, פרו, بترو, بدرو, بيتار, بيتر, بيتكو, بيدرو, بير, بيرو, بيوتر, بييت, بيير, بييرو, پتروس, پدرو, পিটার, ปิแอร์, オリガ, オルガ, パー, ピエロ, ピエール, ピオトル, ピョートル, ピーター, ペトラ, ペドロ, ペレ, ペロ, ペーター, 佩卓, 佩尔, 佩德罗, 佩楚斯, 佩特, 佩瑞, 佩科, 佩翠, 佩雷, 彼得, 彼德, 比特, 皮埃爾, 皮尔, 皮得, and 皮特
| lando di pietro Italian artist, -1340, IT (b. 1280) |
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| agnolo di pietro Italian sculptor, IT (b. 1301) |
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| nicolò di pietro Italian painter from Venice, IT (b. 1350) |
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| da lugano pietro (b. 1510) |
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camillo di pietro Catholic cardinal, IT (b. 1806) |
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| marc pietro (b. 1757) |
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| francesco de pietro Italian catholic bishop (1844-1934), IT (b. 1844) |
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cagnaccio di san pietro Italian painter (1897-1946), IT (b. 1897) |
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| pio di pietro IT (b. 1862) |
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bruno pietro IT (b. 1920) |
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maria sylvia zanella di pietro Brazilian jurist, BR (b. 1943) |
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| pasquale di pietro Italian cyclist, IT (b. 1896) |
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giovanni di pietro Italian politician, IT (b. 1947) |
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bruno di pietro Italian painter and sculptor, IT (b. 1947) |
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| luigi del pietro Swiss presbyter (1906-1977), CH (b. 1906) |
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Melo, Vieira, Martins, Machado, Santana, Santoro, Almeida, Andrade, Colombo, Barbosa, Bianchi, Pereira, Ribeiro, Freitas, Ferrari, Carvalho, Giordano, Esposito, Ferreira, Oliveira, Rodrigues, Goncalves, Romano, Fernandes, Caruso, Soares, Rosa, Dias, Lima, Sanna, Silva, Sousa, Souza, Alves, Costa, Bruno, Pinto, Rossi, Rocha, Rizzo, Russo, Gallo, Gomes, Greco, Lopes, Marino, Santos, Araujo, and Nascimento