Popularity in Northern Ireland
Numbers
| Thea (feminine) | |||
| Year | Rank | Percent Used | |
| 2023 | #72 | 0.283 | |
| 2022 | #58 | 0.371 | |
| 2021 | #68 | 0.298 | |
| 2020 | #68 | 0.319 | |
| 2019 | #40 | 0.464 | |
| 2018 | #69 | 0.303 | |
| 2017 | #49 | 0.394 | |
| 2016 | #42 | 0.463 | |
| 2015 | - | - | |
| 2014 | - | - | |
| 2013 | - | - | |
| 2012 | - | - | |
| 2011 | - | - | |
| 2010 | - | - | |
| 2009 | - | - | |
| 2008 | - | - | |
| 2007 | - | - | |
| 2006 | - | - | |
| 2005 | - | - | |
| 2004 | - | - | |
| 2003 | - | - | |
| 2002 | - | - | |
| 2001 | - | - | |
| 2000 | - | - | |
| 1999 | - | - | |
| 1998 | - | - | |
| 1997 | - | - | |
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