Rhiannon is a distinctive girls' name in United States, ranking #537 in 2002 with 511 recorded births. The name reached its all-time peak in 1999 with 651 births ranking #424. Since 1996, the popularity has increased by 72.1%. In 2002, approximately 1 in every 3,516 girls born was named Rhiannon. STABLE Recent data shows the name is currently stable.