Rainbow is a distinctive girls' name in United States, ranking #9215 in 2001 with 11 recorded births. This places Rainbow in the bottom 49% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2018 with 25 births ranking #5290. In 2001, approximately 1 in every 163,687 girls born was named Rainbow. FALLING Recent data shows the name is currently falling.