Siobhan is a distinctive girls' name in England & Wales, ranking #896 in 2010 with 39 recorded births. The name reached its all-time peak in 1996 with 332 births ranking #138. Since 1996, the popularity has decreased by 88.3%. In 2010, approximately 1 in every 8,232 girls born was named Siobhan. STABLE Recent data shows the name is currently stable.