Cy is a distinctive boys' name in United States, ranking #1504 in 2000 with 80 recorded births. The name reached its all-time peak in 2010 with 117 births ranking #1416. Since 1996, the popularity has increased by 73.9%. In 2000, approximately 1 in every 24,549 boys born was named Cy. FALLING Recent data shows the name is currently falling.