Siobhan is a distinctive girls' name in United States, ranking #2448 in 2010 with 77 recorded births. The name reached its all-time peak in 1997 with 139 births ranking #1272. Since 1996, the popularity has decreased by 44.2%. In 2010, approximately 1 in every 23,082 girls born was named Siobhan. FALLING Recent data shows the name is currently falling.