Siobhan is a distinctive girls' name in United States, ranking #2592 in 2013 with 69 recorded births. The name reached its all-time peak in 1997 with 139 births ranking #1272. Since 1996, the popularity has decreased by 50.0%. In 2013, approximately 1 in every 25,426 girls born was named Siobhan. FALLING Recent data shows the name is currently falling.