Rhiannon is a distinctive girls' name in United States, ranking #1897 in 2013 with 106 recorded births. The name reached its all-time peak in 1999 with 651 births ranking #424. Since 1996, the popularity has decreased by 64.3%. In 2013, approximately 1 in every 16,551 girls born was named Rhiannon. STABLE Recent data shows the name is currently stable.