Siera is a distinctive girls' name in United States, ranking #1225 in 1998 with 150 recorded births. This places Siera in the top 7% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1998 with 150 births ranking #1225. In 1998, approximately 1 in every 11,779 girls born was named Siera. FALLING Recent data shows the name is currently falling.