Rhiannon is a distinctive girls' name in United States, ranking #1126 in 2022 with 219 recorded births. The name reached its all-time peak in 1999 with 651 births ranking #424. Since 1996, the popularity has decreased by 26.3%. In 2022, approximately 1 in every 7,483 girls born was named Rhiannon. STABLE Recent data shows the name is currently stable.