Sian is a distinctive girls' name in England & Wales, ranking #3035 in 2025 with 8 recorded births. The name reached its all-time peak in 1997 with 760 births ranking #72. Since 1996, the popularity has decreased by 98.9%. In 2025, approximately 1 in every 31,660 girls born was named Sian. FALLING Recent data shows the name is currently falling.