Rhiannon is a distinctive girls' name in England & Wales, ranking #944 in 2013 with 39 recorded births. The name reached its all-time peak in 1998 with 657 births ranking #83. Since 1996, the popularity has decreased by 94.0%. In 2013, approximately 1 in every 7,909 girls born was named Rhiannon. STABLE Recent data shows the name is currently stable.