Glennon is a rare boys' name that was most common in the 1950s and has all but disappeared.
Glennon is a boy name. It last appears in U.S. records in 1995. Glennon was first reported in SSA data in 1912 and peaked in 1957 (33 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 1995 | 6 | — | #8,158 |
| 1991 | 6 | — | #7,600 |
| 1990 | 6 | — | #7,493 |
| 1989 | 6 | — | #7,312 |
| 1987 | 9 | — | #4,701 |
| 1986 | 12 | — | #3,717 |
| 1985 | 5 | — | #6,914 |
| 1983 | 6 | — | #5,729 |
| 1982 | 6 | — | #5,902 |
| 1981 | 5 | — | #6,633 |
| 1979 | 6 | — | #5,607 |
| 1975 | 6 | — | #5,029 |
| 1974 | 9 | — | #3,663 |
| 1972 | 6 | — | #4,638 |
| 1971 | 10 | — | #3,231 |
| 1970 | 19 | — | #2,086 |
| 1969 | 12 | — | #2,601 |
| 1968 | 8 | — | #3,202 |
| 1967 | 15 | — | #2,070 |
| 1966 | 5 | — | #4,168 |
| 1965 | 19 | — | #1,828 |
| 1964 | 18 | — | #1,926 |
| 1963 | 21 | — | #1,761 |
| 1962 | 20 | — | #1,830 |
| 1961 | 28 | — | #1,536 |
| 1960 | 16 | — | #2,067 |
| 1959 | 23 | — | #1,685 |
| 1958 | 18 | — | #1,921 |
| 1957 | 33 | — | #1,374 |
| 1956 | 15 | — | #2,124 |
| 1955 | 19 | — | #1,811 |
| 1954 | 19 | — | #1,786 |
| 1953 | 24 | — | #1,562 |
| 1952 | 21 | — | #1,681 |
| 1951 | 26 | — | #1,473 |
| 1950 | 22 | — | #1,585 |
| 1949 | 22 | — | #1,594 |
| 1948 | 23 | — | #1,532 |
| 1947 | 25 | — | #1,500 |
| 1946 | 25 | — | #1,421 |
| 1945 | 21 | — | #1,465 |
| 1944 | 13 | — | #2,031 |
| 1943 | 26 | — | #1,380 |
| 1942 | 15 | — | #1,900 |
| 1941 | 24 | — | #1,385 |
| 1940 | 17 | — | #1,706 |
| 1939 | 20 | — | #1,508 |
| 1938 | 24 | — | #1,381 |
| 1937 | 17 | — | #1,715 |
| 1936 | 24 | — | #1,370 |
| 1935 | 7 | — | #3,081 |
| 1934 | 17 | — | #1,744 |
| 1933 | 20 | — | #1,561 |
| 1932 | 17 | — | #1,801 |
| 1931 | 14 | — | #2,037 |
| 1930 | 25 | — | #1,477 |
| 1929 | 25 | — | #1,461 |
| 1928 | 32 | — | #1,284 |
| 1927 | 21 | — | #1,711 |
| 1926 | 31 | — | #1,309 |
| 1925 | 16 | — | #2,040 |
| 1924 | 21 | — | #1,746 |
| 1923 | 26 | — | #1,473 |
| 1922 | 26 | — | #1,482 |
| 1921 | 20 | — | #1,791 |
| 1920 | 25 | — | #1,523 |
| 1919 | 12 | — | #2,420 |
| 1918 | 15 | — | #2,106 |
| 1917 | 13 | — | #2,218 |
| 1916 | 25 | — | #1,394 |
| 1915 | 12 | — | #2,227 |
| 1914 | 11 | — | #2,021 |
| 1913 | 7 | — | #2,356 |
| 1912 | 5 | — | #2,686 |