Popularity in the United States (by decade)
Numbers
| Riley (feminine) | Riley (masculine) | |||||
| Year | Rank | Percent Used | Rank | Percent Used | ||
| 2020 | #36 | 0.297 | #252 | 0.075 | ||
| 2010 | #34 | 0.292 | #179 | 0.115 | ||
| 2000 | #67 | 0.224 | #107 | 0.186 | ||
| 1990 | #272 | 0.052 | #175 | 0.092 | ||
| 1980 | #1738 | 0.004 | #477 | 0.018 | ||
| 1970 | - | - | #789 | 0.006 | ||
| 1960 | - | - | #780 | 0.005 | ||
| 1950 | - | - | #622 | 0.007 | ||
| 1940 | - | - | #486 | 0.011 | ||
| 1930 | - | - | #469 | 0.014 | ||
| 1920 | - | - | #470 | 0.015 | ||
| 1910 | - | - | #441 | 0.017 | ||
| 1900 | - | - | #334 | 0.026 | ||
| 1890 | - | - | #283 | 0.031 | ||
| 1880 | - | - | #243 | 0.039 | ||
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