Cy is a distinctive boys' name in United States, ranking #1560 in 1999 with 71 recorded births. This places Cy in the top 13% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2010 with 117 births ranking #1416. Since 1996, the popularity has increased by 54.3%. In 1999, approximately 1 in every 27,043 boys born was named Cy. FALLING Recent data shows the name is currently falling.