Sian is a distinctive girls' name in United States, ranking #4487 in 2002 with 28 recorded births. This places Sian in the top 25% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2006 with 35 births ranking #4252. Since 1996, the popularity has increased by 154.5%. In 2002, approximately 1 in every 64,172 girls born was named Sian. FALLING Recent data shows the name is currently falling.