Cy has been given to about 3,921 people in the United States since 1880. It was most common in 2010, which makes it a millennial-parent name.
Its best year was 2010, when 117 babies were given the name, ranking 1416th. The typical living American called Cy is about 22 years old today. It is relatively most common in New York, where it accounts for 0.01% of births.
Source: US Social Security Administration, national and state name files, 2025 release, and the Office for National Statistics for England and Wales. Etymology researched and written by our editors. Living-population and median-age figures are our own estimates, described in the methodology.