Sia is a distinctive girls' name in England & Wales, ranking #622 in 2025 with 63 recorded births. This places Sia in the top 8% of ranked UK girls' names for the year. Its actual usage is classified as Uncommon. The name reached its all-time peak in 2017 with 91 births ranking #480. In 2025, approximately 1 in every 4,020 girls born was named Sia. STABLE Recent data shows the name is currently stable.