Sian is a distinctive girls' name in United States, ranking #14768 in 2012 with 7 recorded births. The name reached its all-time peak in 2006 with 35 births ranking #4252. Since 1996, the popularity has decreased by 36.4%. In 2012, approximately 1 in every 251,535 girls born was named Sian. FALLING Recent data shows the name is currently falling.