The baby name Siobhan appears in baby name data for the United States from 1956 to 2024. It was most popular in 1979 with 298 babies given the name.
In the later years of this period, Siobhan has become less common than it once was.
| Year | Count |
|---|---|
| 1956 | 21 |
| 1957 | 46 |
| 1958 | 64 |
| 1959 | 62 |
| 1960 | 87 |
| 1961 | 75 |
| 1962 | 18 |
| 1963 | 32 |
| 1964 | 29 |
| 1965 | 58 |
| 1966 | 49 |
| 1967 | 52 |
| 1968 | 50 |
| 1969 | 47 |
| 1970 | 67 |
| 1971 | 55 |
| 1972 | 44 |
| 1973 | 52 |
| 1974 | 35 |
| 1975 | 32 |
| 1976 | 41 |
| 1977 | 64 |
| 1978 | 129 |
| 1979 | 298 |
| 1980 | 280 |
| 1981 | 191 |
| 1982 | 194 |
| 1983 | 160 |
| 1984 | 173 |
| 1985 | 212 |
| 1986 | 137 |
| 1987 | 160 |
| 1988 | 104 |
| 1989 | 122 |
| 1990 | 113 |
| 1991 | 140 |
| 1992 | 76 |
| 1993 | 77 |
| 1994 | 60 |
| 1995 | 85 |
| 1996 | 100 |
| 1997 | 101 |
| 1998 | 76 |
| 1999 | 63 |
| 2000 | 69 |
| 2001 | 36 |
| 2002 | 37 |
| 2003 | 68 |
| 2004 | 23 |
| 2005 | 25 |
| 2006 | 36 |
| 2007 | 27 |
| 2008 | 17 |
| 2009 | 13 |
| 2010 | 40 |
| 2011 | 22 |
| 2012 | 12 |
| 2013 | 11 |
| 2014 | 13 |
| 2015 | 18 |
| 2016 | 24 |
| 2017 | 18 |
| 2018 | 19 |
| 2019 | 15 |
| 2020 | 18 |
| 2021 | 63 |
| 2022 | 53 |
| 2023 | 58 |
| 2024 | 49 |