It is a feminine form of Peter,[1] which is derived from the Greek word "πέτρα" (pronounced [ˈpetra]) meaning "stone, rock".
[2] It is also a common first name in German-speaking countries, Germany, Spain, Netherlands, Czech Republic, Finland, Sweden, Norway, Denmark, Iceland, Croatia, Hungary, Romania, North Macedonia, Slovenia, Bulgaria, Serbia, Slovakia, and Greece.
June 29 is the name day of Peter and Petra.
October 2 is the name day of Petra in Hungary.
August 17 is the name day of Petra in Czechia.