Rhiannon is a popular girls' name in England & Wales, ranking #97 in 2000 with 526 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. Since 1996, the popularity has decreased by 19.6%. In 2000, approximately 1 in every 519 girls born was named Rhiannon. STABLE Recent data shows the name is currently stable.