Siobhan is a distinctive girls' name in United States, ranking #3090 in 2007 with 57 recorded births. The name reached its all-time peak in 1997 with 139 births ranking #1272. Since 1996, the popularity has decreased by 58.7%. In 2007, approximately 1 in every 33,727 girls born was named Siobhan. FALLING Recent data shows the name is currently falling.