Rhianon is a distinctive girls' name in United States, ranking #15568 in 1997 with 5 recorded births. The name reached its all-time peak in 1998 with 14 births ranking #7012. Since 1996, the popularity has decreased by 28.6%. In 1997, approximately 1 in every 348,132 girls born was named Rhianon. FALLING Recent data shows the name is currently falling.