Popularity in Ireland
Numbers
| Declan (masculine) | |||
| Year | Rank | Times Used | |
| 2023 | - | - | |
| 2022 | - | - | |
| 2021 | - | - | |
| 2020 | - | - | |
| 2019 | - | - | |
| 2018 | - | - | |
| 2017 | - | - | |
| 2016 | - | - | |
| 2015 | - | - | |
| 2014 | - | - | |
| 2013 | - | - | |
| 2012 | - | - | |
| 2011 | - | - | |
| 2010 | - | - | |
| 2009 | - | - | |
| 2008 | - | - | |
| 2007 | - | - | |
| 2006 | - | - | |
| 2005 | - | - | |
| 2004 | - | - | |
| 2003 | - | - | |
| 2002 | - | - | |
| 2001 | - | - | |
| 2000 | - | - | |
| 1999 | - | - | |
| 1998 | #98 | 44 | |
| 1997 | #81 | 82 | |
| 1996 | #77 | 87 | |
| 1995 | #75 | 84 | |
| 1994 | #69 | 100 | |
| 1993 | #69 | 101 | |
| 1992 | #61 | 125 | |
| 1991 | #59 | 133 | |
| 1990 | #49 | 173 | |
| 1989 | #45 | 172 | |
| 1988 | #42 | 189 | |
| 1987 | #40 | 234 | |
| 1986 | #40 | 245 | |
| 1985 | #44 | 229 | |
| 1984 | #42 | 253 | |
| 1983 | #40 | 269 | |
| 1982 | #38 | 305 | |
| 1981 | #29 | 343 | |
| 1980 | #32 | 348 | |
| 1979 | #30 | 310 | |
| 1978 | #26 | 349 | |
| 1977 | #24 | 362 | |
| 1976 | #21 | 413 | |
| 1975 | #21 | 408 | |
| 1974 | #21 | 434 | |
| 1973 | #14 | 529 | |
| 1972 | #15 | 526 | |
| 1971 | #12 | 574 | |
| 1970 | #15 | 518 | |
| 1969 | #20 | 413 | |
| 1968 | #21 | 399 | |
| 1967 | #21 | 366 | |
| 1966 | #22 | 384 | |
| 1965 | #18 | 412 | |
| 1964 | #23 | 321 | |
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