Rhianon is a distinctive girls' name in United States, ranking #17803 in 2003 with 5 recorded births. This places Rhianon in the bottom 3% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1998 with 14 births ranking #7012. Since 1996, the popularity has decreased by 28.6%. In 2003, approximately 1 in every 365,410 girls born was named Rhianon. FALLING Recent data shows the name is currently falling.