Sierra is a moderately popular girls' name in United States, ranking #168 in 2007 with 2,113 recorded births. The name reached its all-time peak in 1998 with 5,841 births ranking #51. Since 1996, the popularity has decreased by 61.5%. In 2007, approximately 1 in every 910 girls born was named Sierra. STABLE Recent data shows the name is currently stable.