Petra is a distinctive girls' name in United States, ranking #1713 in 2012 with 122 recorded births. The name reached its all-time peak in 2015 with 176 births ranking #1351. Since 1996, the popularity has increased by 43.5%. In 2012, approximately 1 in every 14,432 girls born was named Petra. STABLE Recent data shows the name is currently stable.