Sierra is a highly popular girls' name in United States, ranking #49 in 1999 with 5,715 recorded births. This places Sierra in the top 1% of ranked US girls' names for the year. Its actual usage is classified as Popular. The name reached its all-time peak in 1998 with 5,841 births ranking #51. In 1999, approximately 1 in every 310 girls born was named Sierra. STABLE Recent data shows the name is currently stable.