Siobhan is a distinctive girls' name in England & Wales, ranking #533 in 2006 with 68 recorded births. The name reached its all-time peak in 1996 with 332 births ranking #138. Since 1996, the popularity has decreased by 79.5%. In 2006, approximately 1 in every 4,401 girls born was named Siobhan. STABLE Recent data shows the name is currently stable.