The baby name Cillian appears in baby name data for the United States from 2006 to 2024. It was most popular in 2024 with 649 babies given the name.
In the later years of this period, Cillian has become more popular compared with earlier years.
| Year | Count |
|---|---|
| 2006 | 13 |
| 2008 | 15 |
| 2009 | 10 |
| 2010 | 28 |
| 2011 | 19 |
| 2012 | 29 |
| 2013 | 34 |
| 2014 | 43 |
| 2015 | 74 |
| 2016 | 135 |
| 2017 | 164 |
| 2018 | 171 |
| 2019 | 152 |
| 2020 | 174 |
| 2021 | 327 |
| 2022 | 326 |
| 2023 | 460 |
| 2024 | 649 |