Rhiannon is a distinctive girls' name in United States, ranking #1157 in 2020 with 204 recorded births. The name reached its all-time peak in 1999 with 651 births ranking #424. Since 1996, the popularity has decreased by 31.3%. In 2020, approximately 1 in every 7,919 girls born was named Rhiannon. STABLE Recent data shows the name is currently stable.