Rhiannon is a distinctive girls' name in England & Wales, ranking #1407 in 2025 with 22 recorded births. The name reached its all-time peak in 1998 with 657 births ranking #83. Since 1996, the popularity has decreased by 96.6%. In 2025, approximately 1 in every 11,513 girls born was named Rhiannon. STABLE Recent data shows the name is currently stable.