Petra is a distinctive girls' name in United States, ranking #1682 in 2008 with 133 recorded births. The name reached its all-time peak in 2015 with 176 births ranking #1351. Since 1996, the popularity has increased by 56.5%. In 2008, approximately 1 in every 14,216 girls born was named Petra. STABLE Recent data shows the name is currently stable.