Mainor is a distinctive boys' name in United States, ranking #13195 in 2025 with 5 recorded births. This places Mainor in the bottom 5% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2007 with 14 births ranking #6145. In 2025, approximately 1 in every 341,615 boys born was named Mainor. FALLING Recent data shows the name is currently falling.