Popularity in Northern Ireland
Numbers
| Declan (masculine) | |||
| Year | Rank | Percent Used | |
| 2023 | - | - | |
| 2022 | - | - | |
| 2021 | - | - | |
| 2020 | - | - | |
| 2019 | - | - | |
| 2018 | - | - | |
| 2017 | - | - | |
| 2016 | - | - | |
| 2015 | - | - | |
| 2014 | - | - | |
| 2013 | - | - | |
| 2012 | - | - | |
| 2011 | - | - | |
| 2010 | - | - | |
| 2009 | - | - | |
| 2008 | - | - | |
| 2007 | - | - | |
| 2006 | - | - | |
| 2005 | - | - | |
| 2004 | #90 | 0.261 | |
| 2003 | #81 | 0.293 | |
| 2002 | #75 | 0.349 | |
| 2001 | #58 | 0.452 | |
| 2000 | #81 | 0.324 | |
| 1999 | #82 | 0.276 | |
| 1998 | #58 | 0.456 | |
| 1997 | #54 | 0.471 | |
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