Sierra is a moderately popular girls' name in United States, ranking #404 in 2015 with 800 recorded births. The name reached its all-time peak in 1998 with 5,841 births ranking #51. Since 1996, the popularity has decreased by 85.4%. In 2015, approximately 1 in every 2,231 girls born was named Sierra. STABLE Recent data shows the name is currently stable.