Popularity in the United States (by decade)
Numbers
| Isadore (masculine) | Isadore (feminine) | |||||
| Year | Rank | Percent Used | Rank | Percent Used | ||
| 2020 | - | - | - | - | ||
| 2010 | - | - | - | - | ||
| 2000 | - | - | - | - | ||
| 1990 | - | - | - | - | ||
| 1980 | - | - | - | - | ||
| 1970 | - | - | - | - | ||
| 1960 | #1965 | 0.001 | - | - | ||
| 1950 | #1498 | 0.001 | - | - | ||
| 1940 | #1290 | 0.002 | - | - | ||
| 1930 | #961 | 0.004 | - | - | ||
| 1920 | #528 | 0.012 | - | - | ||
| 1910 | #328 | 0.028 | - | - | ||
| 1900 | #358 | 0.024 | - | - | ||
| 1890 | #468 | 0.014 | #1763 | 0.001 | ||
| 1880 | #640 | 0.008 | #1507 | 0.001 | ||
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