The name Petra is a girl's name of Greek origin meaning "rock, stone". Petra and is often added to lists like Unique Vintage Baby Names for Girls and discussed in our forums with posts like "Baby a Day".
From the experts:
An exotic Greek name with something of a Slavic feel, Petra is a relatively recent feminization of Peter, though it relates back to an incredible ancient city in Jordan that was rediscovered in the early nineteenth century.
Currently the second most popular name in Croatia and in the Top 20 in Hungary, Petra actually did rank in the U.S. Top 1000 every year from 1880 to 1951, reaching a high of Number 493 in 1929.
There have been Petras in two European film classics: Ingmar Bergman's Smiles of a Summer Night and Rainer Werner Fassbinder's The Bitter Tears of Petra von Kant.
The most prominent Petra in recent years is gorgeous supermodel Petra Nemcova--who is now an international disaster relief activist.