Willmar is a very rare variant of Wilmer that was most common in the 1910s and has all but disappeared.
Willmar is a boy name. It last appears in U.S. records in 1928. Willmar first appears in 1913 and peaked in 1915 (9 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 1928 | 6 | — | #4,139 |
| 1926 | 8 | — | #3,375 |
| 1924 | 5 | — | #4,956 |
| 1922 | 5 | — | #4,953 |
| 1921 | 5 | — | #4,966 |
| 1920 | 6 | — | #4,273 |
| 1918 | 9 | — | #3,091 |
| 1917 | 6 | — | #3,969 |
| 1915 | 9 | — | #2,822 |
| 1913 | 6 | — | #2,809 |