Sia is a distinctive girls' name in England & Wales, ranking #1225 in 2011 with 26 recorded births. This places Sia in the top 16% of ranked UK girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2017 with 91 births ranking #480. In 2011, approximately 1 in every 12,358 girls born was named Sia. STABLE Recent data shows the name is currently stable.