Sia is a distinctive girls' name in England & Wales, ranking #1018 in 2012 with 35 recorded births. This places Sia in the top 13% 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 2012, approximately 1 in every 9,202 girls born was named Sia. STABLE Recent data shows the name is currently stable.