Sian is a distinctive girls' name in United States, ranking #6449 in 1997 with 15 recorded births. The name reached its all-time peak in 2006 with 35 births ranking #4252. Since 1996, the popularity has increased by 36.4%. In 1997, approximately 1 in every 116,044 girls born was named Sian. FALLING Recent data shows the name is currently falling.