Petra: Name day
Name Day List: Petra
| Country | Day | Month | Names |
 Austria | 31 | May | Helma, Mechthild, Petra |
 USA | 31 | May | Camila, Camilla, Camille, Petra, Petronella, Pier |
 Finland | 29 | June | Pekka, Petri, Petra, Peetu, Pekko, Petteri, Pietari, Petrus, Petja |
 Sweden | 29 | June | Peter, Petra |
 Norway | 1 | August | Peder, Petra |
 Czechia | 17 | August | Petra |
 Hungary | 2 | October | Petra |
 Croatia | 18 | November | Petra, Pavla |
Name Day List - similar names (Petra)
| Country | Day | Month | Names |
 Bulgaria | 29 | June | Apostol, Kamen, Pavel, Pavlin, Pavlina, Pejo, Penka, Pencho, Petrana, Petar, Petya, Petzo, Petar, Petya, Pavel, Pavlina, Polina, Kamen, Asen, Asya, Desislava, Krym, Rumen, Rumyana, Chavdar, Asen, Asya, Desislava, Krum |
 Lithuania | 29 | June | Benita, Gedrime, Mantigirdas, Petras, Povilas |