Sian is a distinctive girls' name in England & Wales, ranking #784 in 2013 with 49 recorded births. The name reached its all-time peak in 1997 with 760 births ranking #72. Since 1996, the popularity has decreased by 93.3%. In 2013, approximately 1 in every 6,295 girls born was named Sian. FALLING Recent data shows the name is currently falling.