Rheagan is a distinctive girls' name in United States, ranking #4970 in 2001 with 24 recorded births. The name reached its all-time peak in 2004 with 31 births ranking #4465. Since 1996, the popularity has increased by 118.2%. In 2001, approximately 1 in every 75,023 girls born was named Rheagan. FALLING Recent data shows the name is currently falling.