Popularity in the United States (by decade)
Numbers
| Leonard (masculine) | Leonard (feminine) | |||||
| Year | Rank | Percent Used | Rank | Percent Used | ||
| 2020 | #636 | 0.023 | - | - | ||
| 2010 | #648 | 0.020 | - | - | ||
| 2000 | #592 | 0.018 | - | - | ||
| 1990 | #383 | 0.030 | - | - | ||
| 1980 | #228 | 0.054 | - | - | ||
| 1970 | #166 | 0.092 | - | - | ||
| 1960 | #120 | 0.145 | - | - | ||
| 1950 | #88 | 0.212 | - | - | ||
| 1940 | #62 | 0.292 | - | - | ||
| 1930 | #52 | 0.361 | #1728 | 0.002 | ||
| 1920 | #38 | 0.473 | #1419 | 0.003 | ||
| 1910 | #43 | 0.459 | #1836 | 0.002 | ||
| 1900 | #50 | 0.342 | - | - | ||
| 1890 | #62 | 0.257 | - | - | ||
| 1880 | #80 | 0.182 | - | - | ||
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