Sian is a popular girls' name in England & Wales, ranking #72 in 1997 with 760 recorded births. This places Sian in the top 1% of ranked UK girls' names for the year. Its actual usage is classified as Popular. The name reached its all-time peak in 1997 with 760 births ranking #72. In 1997, approximately 1 in every 386 girls born was named Sian. FALLING Recent data shows the name is currently falling.