Cy is a distinctive boys' name in United States, ranking #1682 in 1998 with 61 recorded births. The name reached its all-time peak in 2010 with 117 births ranking #1416. Since 1996, the popularity has increased by 32.6%. In 1998, approximately 1 in every 31,333 boys born was named Cy. FALLING Recent data shows the name is currently falling.