Sian is a moderately popular girls' name in England & Wales, ranking #118 in 2001 with 399 recorded births. The name reached its all-time peak in 1997 with 760 births ranking #72. Since 1996, the popularity has decreased by 45.4%. In 2001, approximately 1 in every 672 girls born was named Sian. FALLING Recent data shows the name is currently falling.