Rhiannon is a popular girls' name in England & Wales, ranking #86 in 1997 with 591 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 1997, approximately 1 in every 496 girls born was named Rhiannon. STABLE Recent data shows the name is currently stable.