Sian is a moderately popular girls' name in England & Wales, ranking #239 in 2006 with 196 recorded births. The name reached its all-time peak in 1997 with 760 births ranking #72. Since 1996, the popularity has decreased by 73.2%. In 2006, approximately 1 in every 1,527 girls born was named Sian. FALLING Recent data shows the name is currently falling.