Sian is a distinctive girls' name in United States, ranking #16925 in 2025 with 5 recorded births. This places Sian in the bottom 2% 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 decreased by 54.5%. In 2025, approximately 1 in every 321,453 girls born was named Sian. FALLING Recent data shows the name is currently falling.