Petra is a distinctive girls' name in United States, ranking #1746 in 2011 with 118 recorded births. The name reached its all-time peak in 2015 with 176 births ranking #1351. Since 1996, the popularity has increased by 38.8%. In 2011, approximately 1 in every 14,905 girls born was named Petra. STABLE Recent data shows the name is currently stable.