Siobhan is a distinctive girls' name in United States, ranking #4365 in 2017 with 33 recorded births. The name reached its all-time peak in 1997 with 139 births ranking #1272. Since 1996, the popularity has decreased by 76.1%. In 2017, approximately 1 in every 52,299 girls born was named Siobhan. FALLING Recent data shows the name is currently falling.