Rheannon is a distinctive girls' name in United States, ranking #5646 in 2000 with 20 recorded births. The name reached its all-time peak in 1999 with 20 births ranking #5384. Since 1996, the popularity has increased by 81.8%. In 2000, approximately 1 in every 90,799 girls born was named Rheannon. FALLING Recent data shows the name is currently falling.