The baby name Kathlyn appears in baby name data for the United States from 1914 to 2024. It was most popular in 1949 with 88 babies given the name.
In the later years of this period, Kathlyn has become less common than it once was.
| Year | Count |
|---|---|
| 1914 | 82 |
| 1915 | 87 |
| 1916 | 59 |
| 1917 | 47 |
| 1918 | 27 |
| 1919 | 28 |
| 1920 | 16 |
| 1921 | 40 |
| 1922 | 31 |
| 1923 | 35 |
| 1924 | 41 |
| 1927 | 11 |
| 1930 | 10 |
| 1937 | 12 |
| 1940 | 5 |
| 1941 | 10 |
| 1943 | 16 |
| 1944 | 27 |
| 1945 | 22 |
| 1946 | 42 |
| 1947 | 56 |
| 1948 | 58 |
| 1949 | 88 |
| 1950 | 66 |
| 1951 | 56 |
| 1952 | 62 |
| 1953 | 77 |
| 1954 | 39 |
| 1955 | 14 |
| 1956 | 31 |
| 1957 | 22 |
| 1958 | 8 |
| 1959 | 26 |
| 1960 | 17 |
| 1966 | 21 |
| 1981 | 5 |
| 1985 | 10 |
| 1987 | 5 |
| 1988 | 32 |
| 1989 | 5 |
| 1990 | 32 |
| 1991 | 5 |
| 1992 | 14 |
| 1993 | 10 |
| 1994 | 5 |
| 1995 | 10 |
| 1998 | 12 |
| 2000 | 5 |
| 2003 | 12 |
| 2004 | 10 |
| 2005 | 12 |
| 2006 | 14 |
| 2015 | 5 |
| 2024 | 28 |