Casy is a distinctive boys' name in United States, ranking #10139 in 1999 with 5 recorded births. This places Casy in the bottom 13% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1998 with 7 births ranking #7685. In 1999, approximately 1 in every 384,017 boys born was named Casy. STABLE Recent data shows the name is currently stable.