Sian is a distinctive girls' name in United States, ranking #7302 in 2009 with 18 recorded births. The name reached its all-time peak in 2006 with 35 births ranking #4252. Since 1996, the popularity has increased by 63.6%. In 2009, approximately 1 in every 102,048 girls born was named Sian. FALLING Recent data shows the name is currently falling.