Sian is a moderately popular girls' name in England & Wales, ranking #302 in 2007 with 155 recorded births. The name reached its all-time peak in 1997 with 760 births ranking #72. Since 1996, the popularity has decreased by 78.8%. In 2007, approximately 1 in every 1,975 girls born was named Sian. FALLING Recent data shows the name is currently falling.