Siobhan is a distinctive girls' name in United States, ranking #3107 in 2014 with 54 recorded births. The name reached its all-time peak in 1997 with 139 births ranking #1272. Since 1996, the popularity has decreased by 60.9%. In 2014, approximately 1 in every 33,073 girls born was named Siobhan. FALLING Recent data shows the name is currently falling.