Boleslaus is a very rare boys' name that was most common in the 1920s and has all but disappeared.
Boleslaus is a boy name. It last appears in U.S. records in 1932. Boleslaus was first reported in SSA data in 1911 and peaked in 1923 (25 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 1932 | 7 | — | #3,119 |
| 1930 | 5 | — | #4,055 |
| 1929 | 5 | — | #4,026 |
| 1928 | 8 | — | #3,103 |
| 1927 | 5 | — | #4,269 |
| 1925 | 11 | — | #2,610 |
| 1924 | 13 | — | #2,364 |
| 1923 | 25 | — | #1,508 |
| 1922 | 22 | — | #1,654 |
| 1921 | 18 | — | #1,915 |
| 1920 | 7 | — | #3,520 |
| 1919 | 18 | — | #1,818 |
| 1918 | 16 | — | #2,008 |
| 1917 | 11 | — | #2,440 |
| 1916 | 15 | — | #1,966 |
| 1915 | 22 | — | #1,466 |
| 1914 | 15 | — | #1,614 |
| 1913 | 17 | — | #1,262 |
| 1912 | 10 | — | #1,630 |
| 1911 | 5 | — | #1,772 |