Cy is a distinctive boys' name in United States, ranking #1607 in 2009 with 99 recorded births. The name reached its all-time peak in 2010 with 117 births ranking #1416. Since 1996, the popularity has increased by 115.2%. In 2009, approximately 1 in every 20,033 boys born was named Cy. FALLING Recent data shows the name is currently falling.