Sian is a distinctive girls' name in United States, ranking #4818 in 2001 with 25 recorded births. The name reached its all-time peak in 2006 with 35 births ranking #4252. Since 1996, the popularity has increased by 127.3%. In 2001, approximately 1 in every 72,022 girls born was named Sian. FALLING Recent data shows the name is currently falling.