Rhianon is a distinctive girls' name in United States, ranking #11144 in 1999 with 8 recorded births. The name reached its all-time peak in 1998 with 14 births ranking #7012. Since 1996, the popularity has increased by 14.3%. In 1999, approximately 1 in every 221,723 girls born was named Rhianon. FALLING Recent data shows the name is currently falling.