Popularity in the United States (by decade)
Numbers
| Billy (feminine) | Billy (masculine) | |||||
| Year | Rank | Percent Used | Rank | Percent Used | ||
| 2020 | - | - | #1033 | 0.011 | ||
| 2010 | - | - | #759 | 0.015 | ||
| 2000 | - | - | #454 | 0.027 | ||
| 1990 | - | - | #258 | 0.053 | ||
| 1980 | - | - | #133 | 0.107 | ||
| 1970 | #1479 | 0.004 | #84 | 0.194 | ||
| 1960 | #1644 | 0.003 | #73 | 0.247 | ||
| 1950 | #1471 | 0.002 | #67 | 0.289 | ||
| 1940 | #1064 | 0.004 | #42 | 0.447 | ||
| 1930 | #648 | 0.010 | #20 | 0.814 | ||
| 1920 | #696 | 0.009 | #48 | 0.370 | ||
| 1910 | #1296 | 0.003 | #249 | 0.043 | ||
| 1900 | #1860 | 0.001 | #505 | 0.014 | ||
| 1890 | - | - | #682 | 0.008 | ||
| 1880 | - | - | #772 | 0.005 | ||
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