Willmar is a boy name. It last appeared in U.S. Social Security records in 1928. Willmar first appears in the data in 1913 and reached its peak in 1915 (9 births). The chart below shows how the name has risen and fallen over time.
| Year | U.S. births | Rank |
|---|---|---|
| 1928 | 6 | #7,391 |
| 1926 | 8 | #6,294 |
| 1924 | 5 | #8,825 |
| 1922 | 5 | #8,730 |
| 1921 | 5 | #8,799 |
| 1920 | 6 | #7,767 |
| 1918 | 9 | #5,881 |
| 1917 | 6 | #7,235 |
| 1915 | 9 | #5,356 |
| 1913 | 6 | #5,418 |