Rainy is a distinctive girls' name in United States, ranking #4827 in 2015 with 29 recorded births. The name reached its all-time peak in 2014 with 31 births ranking #4630. Since 1996, the popularity has increased by 61.1%. In 2015, approximately 1 in every 61,540 girls born was named Rainy. FALLING Recent data shows the name is currently falling.