Petra is a distinctive girls' name in United States, ranking #1749 in 2007 with 124 recorded births. The name reached its all-time peak in 2015 with 176 births ranking #1351. Since 1996, the popularity has increased by 45.9%. In 2007, approximately 1 in every 15,504 girls born was named Petra. STABLE Recent data shows the name is currently stable.