Masaji is a very rare boys' name that was most common in the 1910s and has all but disappeared.
Masaji is a boy name. It last appears in U.S. records in 1933. Masaji first appears in 1913 and peaked in 1913 (11 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 1933 | 5 | — | #3,977 |
| 1925 | 7 | — | #3,620 |
| 1923 | 5 | — | #4,649 |
| 1922 | 5 | — | #4,723 |
| 1919 | 8 | — | #3,288 |
| 1918 | 6 | — | #4,002 |
| 1917 | 5 | — | #4,353 |
| 1916 | 10 | — | #2,669 |
| 1913 | 11 | — | #1,763 |