Siobhan is a distinctive girls' name in United States, ranking #1953 in 2002 with 91 recorded births. The name reached its all-time peak in 1997 with 139 births ranking #1272. Since 1996, the popularity has decreased by 34.1%. In 2002, approximately 1 in every 19,745 girls born was named Siobhan. FALLING Recent data shows the name is currently falling.