William vs Willliam
William vs Willliam: side-by-side popularity history from official U.S. Social Security birth records.
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William
| Total recorded births | 4,199,696 |
| Peak year | 1947 (#4) |
| Years on the list | 146 |
| 10-year trend | -22.9% |
Willliam
| Total recorded births | 273 |
| Peak year | 2006 (#6889) |
| Years on the list | 42 |
| 10-year trend | -13.3% |
Figures are from the U.S. Social Security Administration Popular Baby Names dataset (public domain). Names with fewer than 5 recorded births in a year or state are suppressed by the source.