Siobhan is a distinctive girls' name in United States, ranking #3551 in 2018 with 44 recorded births. The name reached its all-time peak in 1997 with 139 births ranking #1272. Since 1996, the popularity has decreased by 68.1%. In 2018, approximately 1 in every 38,646 girls born was named Siobhan. FALLING Recent data shows the name is currently falling.