Sian is a distinctive girls' name in United States, ranking #12328 in 2018 with 8 recorded births. The name reached its all-time peak in 2006 with 35 births ranking #4252. Since 1996, the popularity has decreased by 27.3%. In 2018, approximately 1 in every 212,553 girls born was named Sian. FALLING Recent data shows the name is currently falling.