Popularity in the United States (by decade)
Numbers
| Reilly (masculine) | Reilly (feminine) | |||||
| Year | Rank | Percent Used | Rank | Percent Used | ||
| 2020 | - | - | - | - | ||
| 2010 | #1543 | 0.005 | - | - | ||
| 2000 | #939 | 0.009 | #1009 | 0.012 | ||
| 1990 | #1135 | 0.005 | #1159 | 0.008 | ||
| 1980 | - | - | - | - | ||
| 1970 | - | - | - | - | ||
| 1960 | - | - | - | - | ||
| 1950 | - | - | - | - | ||
| 1940 | - | - | - | - | ||
| 1930 | - | - | - | - | ||
| 1920 | - | - | - | - | ||
| 1910 | - | - | - | - | ||
| 1900 | - | - | - | - | ||
| 1890 | - | - | - | - | ||
| 1880 | - | - | - | - | ||
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