Rhiannon is a popular girls' name in England & Wales, ranking #84 in 1996 with 654 recorded births. This places Rhiannon in the top 2% of ranked UK girls' names for the year. Its actual usage is classified as Popular. The name reached its all-time peak in 1998 with 657 births ranking #83. In 1996, approximately 1 in every 453 girls born was named Rhiannon. STABLE Recent data shows the name is currently stable.