Siobhan is a distinctive girls' name in United States, ranking #3217 in 2011 with 52 recorded births. The name reached its all-time peak in 1997 with 139 births ranking #1272. Since 1996, the popularity has decreased by 62.3%. In 2011, approximately 1 in every 33,823 girls born was named Siobhan. FALLING Recent data shows the name is currently falling.