Cy is a distinctive boys' name in United States, ranking #1603 in 2001 with 74 recorded births. The name reached its all-time peak in 2010 with 117 births ranking #1416. Since 1996, the popularity has increased by 60.9%. In 2001, approximately 1 in every 26,254 boys born was named Cy. FALLING Recent data shows the name is currently falling.