Popularity in the United States (by decade)
Numbers
| William (feminine) | William (masculine) | |||||
| Year | Rank | Percent Used | Rank | Percent Used | ||
| 2020 | - | - | #6 | 0.629 | ||
| 2010 | - | - | #4 | 0.796 | ||
| 2000 | - | - | #10 | 0.914 | ||
| 1990 | - | - | #18 | 1.060 | ||
| 1980 | #947 | 0.009 | #15 | 1.290 | ||
| 1970 | #778 | 0.011 | #9 | 1.657 | ||
| 1960 | #765 | 0.009 | #7 | 2.149 | ||
| 1950 | #828 | 0.007 | #6 | 2.881 | ||
| 1940 | #625 | 0.010 | #4 | 3.671 | ||
| 1930 | #476 | 0.017 | #4 | 3.840 | ||
| 1920 | #417 | 0.021 | #4 | 4.506 | ||
| 1910 | #555 | 0.013 | #2 | 4.361 | ||
| 1900 | #617 | 0.010 | #2 | 4.724 | ||
| 1890 | #456 | 0.016 | #2 | 5.867 | ||
| 1880 | #332 | 0.026 | #2 | 7.211 | ||
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