Siobhan is a distinctive girls' name in United States, ranking #2096 in 2025 with 90 recorded births. The name reached its all-time peak in 1997 with 139 births ranking #1272. Since 1996, the popularity has decreased by 34.8%. In 2025, approximately 1 in every 17,859 girls born was named Siobhan. FALLING Recent data shows the name is currently falling.