Casyn is a rare variant of Cason that peaked in 2014 and has grown less common since.
Casyn is predominantly a boy name. In 2025 it ranked #5,244 for boy births in the United States (and #11,062 across all names), given to 18 babies. Casyn first appears in 2000 and peaked in 2020 (35 births).
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 18 | 18 | — | #5,244 |
| 2024 | 22 | 22 | — | #4,587 |
| 2023 | 28 | 28 | — | #3,907 |
| 2022 | 26 | 26 | — | #4,110 |
| 2021 | 30 | 30 | — | #3,663 |
| 2020 | 35 | 35 | — | #3,214 |
| 2019 | 30 | 30 | — | #3,649 |
| 2018 | 26 | 26 | — | #4,008 |
| 2017 | 30 | 30 | — | #3,598 |
| 2016 | 29 | 29 | — | #3,703 |
| 2015 | 28 | 28 | — | #3,803 |
| 2014 | 46 | 46 | #9,097 | #3,247 |
| 2013 | 31 | 31 | #14,988 | #3,987 |
| 2012 | 29 | 29 | #12,443 | #4,564 |
| 2011 | 26 | 26 | — | #3,902 |
| 2010 | 22 | 22 | — | #4,385 |
| 2009 | 25 | 25 | — | #4,054 |
| 2008 | 16 | 16 | — | #5,531 |
| 2007 | 15 | 15 | — | #5,691 |
| 2006 | 14 | 14 | — | #5,830 |
| 2005 | 5 | 5 | — | #11,729 |
| 2000 | 5 | 5 | — | #10,610 |