Sian is a distinctive girls' name in United States, ranking #5359 in 2004 with 24 recorded births. The name reached its all-time peak in 2006 with 35 births ranking #4252. Since 1996, the popularity has increased by 118.2%. In 2004, approximately 1 in every 76,505 girls born was named Sian. FALLING Recent data shows the name is currently falling.