Rheagan is a distinctive girls' name in United States, ranking #5853 in 1999 with 18 recorded births. The name reached its all-time peak in 2004 with 31 births ranking #4465. Since 1996, the popularity has increased by 63.6%. In 1999, approximately 1 in every 98,543 girls born was named Rheagan. FALLING Recent data shows the name is currently falling.