Sian is a distinctive girls' name in United States, ranking #5189 in 1999 with 21 recorded births. The name reached its all-time peak in 2006 with 35 births ranking #4252. Since 1996, the popularity has increased by 90.9%. In 1999, approximately 1 in every 84,466 girls born was named Sian. FALLING Recent data shows the name is currently falling.