Sian is a distinctive girls' name in United States, ranking #16690 in 2010 with 6 recorded births. The name reached its all-time peak in 2006 with 35 births ranking #4252. Since 1996, the popularity has decreased by 45.5%. In 2010, approximately 1 in every 296,221 girls born was named Sian. FALLING Recent data shows the name is currently falling.