Popularity in Northern Ireland
Numbers
| Theo (masculine) | |||
| Year | Rank | Percent Used | |
| 2023 | #9 | 1.059 | |
| 2022 | #4 | 1.235 | |
| 2021 | #6 | 1.049 | |
| 2020 | #7 | 1.040 | |
| 2019 | #13 | 0.951 | |
| 2018 | #18 | 0.861 | |
| 2017 | #48 | 0.521 | |
| 2016 | #45 | 0.539 | |
| 2015 | #54 | 0.464 | |
| 2014 | #62 | 0.383 | |
| 2013 | #88 | 0.291 | |
| 2012 | - | - | |
| 2011 | - | - | |
| 2010 | - | - | |
| 2009 | - | - | |
| 2008 | - | - | |
| 2007 | - | - | |
| 2006 | - | - | |
| 2005 | - | - | |
| 2004 | - | - | |
| 2003 | - | - | |
| 2002 | - | - | |
| 2001 | - | - | |
| 2000 | - | - | |
| 1999 | - | - | |
| 1998 | - | - | |
| 1997 | - | - | |
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