Popularity in the United States (by decade)
Numbers
| Lennie (feminine) | Lennie (masculine) | |||||
| Year | Rank | Percent Used | Rank | Percent Used | ||
| 2020 | - | - | - | - | ||
| 2010 | - | - | - | - | ||
| 2000 | - | - | - | - | ||
| 1990 | - | - | - | - | ||
| 1980 | - | - | - | - | ||
| 1970 | - | - | #1593 | 0.002 | ||
| 1960 | - | - | #998 | 0.003 | ||
| 1950 | #1777 | 0.002 | #965 | 0.003 | ||
| 1940 | #1211 | 0.003 | #1199 | 0.002 | ||
| 1930 | #1018 | 0.004 | #1596 | 0.002 | ||
| 1920 | #853 | 0.006 | #1693 | 0.002 | ||
| 1910 | #643 | 0.010 | #1533 | 0.002 | ||
| 1900 | #470 | 0.016 | #1172 | 0.003 | ||
| 1890 | #430 | 0.018 | #986 | 0.004 | ||
| 1880 | #428 | 0.017 | #917 | 0.003 | ||
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