The baby name Glennon appears in baby name data for the United States from 1912 to 1989. It was most popular in 1928 with 27 babies given the name.
Over the period shown, Glennon has stayed at a similar level of popularity.
| Year | Count |
|---|---|
| 1912 | 5 |
| 1913 | 5 |
| 1914 | 9 |
| 1915 | 10 |
| 1916 | 20 |
| 1917 | 11 |
| 1918 | 13 |
| 1919 | 10 |
| 1920 | 20 |
| 1921 | 13 |
| 1922 | 20 |
| 1923 | 19 |
| 1924 | 14 |
| 1925 | 14 |
| 1926 | 24 |
| 1927 | 19 |
| 1928 | 27 |
| 1929 | 19 |
| 1930 | 20 |
| 1931 | 10 |
| 1932 | 14 |
| 1933 | 17 |
| 1934 | 16 |
| 1936 | 17 |
| 1937 | 13 |
| 1938 | 18 |
| 1939 | 11 |
| 1940 | 11 |
| 1941 | 17 |
| 1942 | 11 |
| 1943 | 16 |
| 1944 | 10 |
| 1945 | 16 |
| 1946 | 13 |
| 1947 | 18 |
| 1948 | 13 |
| 1949 | 16 |
| 1950 | 17 |
| 1951 | 19 |
| 1952 | 23 |
| 1953 | 18 |
| 1954 | 12 |
| 1955 | 13 |
| 1956 | 13 |
| 1957 | 25 |
| 1958 | 9 |
| 1959 | 13 |
| 1960 | 12 |
| 1961 | 17 |
| 1962 | 17 |
| 1963 | 11 |
| 1964 | 10 |
| 1965 | 13 |
| 1967 | 9 |
| 1968 | 5 |
| 1969 | 9 |
| 1970 | 11 |
| 1986 | 8 |
| 1987 | 5 |
| 1989 | 5 |