Rhianon is a distinctive girls' name in United States, ranking #9151 in 2004 with 12 recorded births. The name reached its all-time peak in 1998 with 14 births ranking #7012. Since 1996, the popularity has increased by 71.4%. In 2004, approximately 1 in every 153,010 girls born was named Rhianon. FALLING Recent data shows the name is currently falling.