Keymarion is a distinctive boys' name in United States, ranking #10235 in 2013 with 7 recorded births. This places Keymarion in the bottom 27% 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 2013, approximately 1 in every 270,179 boys born was named Keymarion. FALLING Recent data shows the name is currently falling.