Siar is a distinctive boys' name in England & Wales, ranking #1093 in 2025 with 27 recorded births. This places Siar in the top 18% of ranked UK boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2023 with 30 births ranking #987. In 2025, approximately 1 in every 10,072 boys born was named Siar. STABLE Recent data shows the name is currently stable.