Sian is a distinctive girls' name in United States, ranking #4223 in 1998 with 27 recorded births. The name reached its all-time peak in 2006 with 35 births ranking #4252. Since 1996, the popularity has increased by 145.5%. In 1998, approximately 1 in every 65,440 girls born was named Sian. FALLING Recent data shows the name is currently falling.