Sian is a distinctive girls' name in United States, ranking #4687 in 2005 with 29 recorded births. The name reached its all-time peak in 2006 with 35 births ranking #4252. Since 1996, the popularity has increased by 163.6%. In 2005, approximately 1 in every 63,714 girls born was named Sian. FALLING Recent data shows the name is currently falling.