Popularity in the United States (by decade)
Numbers
| Isabel (feminine) | Isabel (masculine) | |||||
| Year | Rank | Percent Used | Rank | Percent Used | ||
| 2020 | #155 | 0.103 | - | - | ||
| 2010 | #142 | 0.118 | - | - | ||
| 2000 | #93 | 0.177 | - | - | ||
| 1990 | #185 | 0.082 | - | - | ||
| 1980 | #443 | 0.027 | - | - | ||
| 1970 | #487 | 0.024 | - | - | ||
| 1960 | #497 | 0.020 | - | - | ||
| 1950 | #450 | 0.020 | #1882 | 0.001 | ||
| 1940 | #404 | 0.023 | #1382 | 0.002 | ||
| 1930 | #292 | 0.040 | #1331 | 0.002 | ||
| 1920 | #222 | 0.067 | #1290 | 0.003 | ||
| 1910 | #189 | 0.090 | #1765 | 0.002 | ||
| 1900 | #174 | 0.094 | #1799 | 0.001 | ||
| 1890 | #188 | 0.087 | - | - | ||
| 1880 | #181 | 0.075 | - | - | ||
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