Popularity in the United States (by decade)
Numbers
| Regan (feminine) | Regan (masculine) | |||||
| Year | Rank | Percent Used | Rank | Percent Used | ||
| 2020 | #1857 | 0.006 | - | - | ||
| 2010 | #1039 | 0.013 | - | - | ||
| 2000 | #496 | 0.030 | #1946 | 0.003 | ||
| 1990 | #603 | 0.020 | #1643 | 0.003 | ||
| 1980 | #1138 | 0.007 | #1656 | 0.002 | ||
| 1970 | #925 | 0.009 | #1181 | 0.003 | ||
| 1960 | #1977 | 0.002 | #979 | 0.003 | ||
| 1950 | - | - | #1376 | 0.002 | ||
| 1940 | - | - | - | - | ||
| 1930 | - | - | - | - | ||
| 1920 | - | - | - | - | ||
| 1910 | - | - | - | - | ||
| 1900 | - | - | - | - | ||
| 1890 | - | - | - | - | ||
| 1880 | - | - | - | - | ||
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