Kelvyn is a distinctive boys' name in United States, ranking #9807 in 1996 with 5 recorded births. This places Kelvyn in the bottom 7% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2008 with 16 births ranking #5641. In 1996, approximately 1 in every 378,847 boys born was named Kelvyn. FALLING Recent data shows the name is currently falling.