The baby name Lon appears in baby name data for the United States from 1912 to 1988. It was most popular in 1948 with 301 babies given the name.
In the later years of this period, Lon has become less common than it once was.
| Year | Count |
|---|---|
| 1912 | 11 |
| 1913 | 8 |
| 1914 | 24 |
| 1915 | 30 |
| 1916 | 18 |
| 1917 | 25 |
| 1918 | 40 |
| 1919 | 25 |
| 1920 | 16 |
| 1921 | 57 |
| 1922 | 20 |
| 1923 | 51 |
| 1924 | 43 |
| 1925 | 19 |
| 1926 | 20 |
| 1927 | 33 |
| 1928 | 14 |
| 1929 | 20 |
| 1930 | 52 |
| 1931 | 29 |
| 1932 | 17 |
| 1933 | 7 |
| 1934 | 5 |
| 1935 | 5 |
| 1936 | 20 |
| 1937 | 25 |
| 1938 | 16 |
| 1939 | 16 |
| 1940 | 46 |
| 1941 | 25 |
| 1942 | 35 |
| 1943 | 21 |
| 1944 | 5 |
| 1945 | 70 |
| 1946 | 88 |
| 1947 | 277 |
| 1948 | 301 |
| 1949 | 225 |
| 1950 | 219 |
| 1951 | 240 |
| 1952 | 252 |
| 1953 | 273 |
| 1954 | 172 |
| 1955 | 266 |
| 1956 | 249 |
| 1957 | 243 |
| 1958 | 207 |
| 1959 | 224 |
| 1960 | 204 |
| 1961 | 126 |
| 1962 | 167 |
| 1963 | 142 |
| 1964 | 158 |
| 1965 | 96 |
| 1966 | 95 |
| 1967 | 115 |
| 1968 | 125 |
| 1969 | 93 |
| 1970 | 96 |
| 1971 | 114 |
| 1972 | 40 |
| 1973 | 42 |
| 1974 | 29 |
| 1975 | 16 |
| 1976 | 34 |
| 1977 | 13 |
| 1978 | 5 |
| 1980 | 5 |
| 1983 | 14 |
| 1984 | 5 |
| 1988 | 5 |