Siobhan is a distinctive girls' name in United States, ranking #2849 in 2009 with 62 recorded births. The name reached its all-time peak in 1997 with 139 births ranking #1272. Since 1996, the popularity has decreased by 55.1%. In 2009, approximately 1 in every 29,627 girls born was named Siobhan. FALLING Recent data shows the name is currently falling.