Cy is a distinctive boys' name in United States, ranking #1768 in 2003 with 68 recorded births. The name reached its all-time peak in 2010 with 117 births ranking #1416. Since 1996, the popularity has increased by 47.8%. In 2003, approximately 1 in every 29,048 boys born was named Cy. FALLING Recent data shows the name is currently falling.