Keymarion is a distinctive boys' name in United States, ranking #8023 in 2009 with 10 recorded births. This places Keymarion in the bottom 45% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2012 with 11 births ranking #7322. In 2009, approximately 1 in every 198,331 boys born was named Keymarion. FALLING Recent data shows the name is currently falling.