Sierra is a distinctive boys' name in United States, ranking #9248 in 2002 with 7 recorded births. This places Sierra in the bottom 26% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2004 with 16 births ranking #5207. Since 1996, the popularity has decreased by 41.7%. In 2002, approximately 1 in every 277,353 boys born was named Sierra. FALLING Recent data shows the name is currently falling.