Petra is a distinctive girls' name in United States, ranking #1655 in 2009 with 135 recorded births. The name reached its all-time peak in 2015 with 176 births ranking #1351. Since 1996, the popularity has increased by 58.8%. In 2009, approximately 1 in every 13,606 girls born was named Petra. STABLE Recent data shows the name is currently stable.