Masaichi is a very rare boys' name that was most common in the 1910s and has all but disappeared.
Masaichi is a boy name. It last appears in U.S. records in 1933. Masaichi was first reported in SSA data in 1912 and peaked in 1918 (21 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 1933 | 6 | — | #3,512 |
| 1930 | 5 | — | #4,352 |
| 1929 | 6 | — | #3,818 |
| 1927 | 8 | — | #3,343 |
| 1926 | 11 | — | #2,675 |
| 1925 | 5 | — | #4,653 |
| 1924 | 14 | — | #2,309 |
| 1923 | 10 | — | #2,878 |
| 1922 | 10 | — | #2,931 |
| 1921 | 7 | — | #3,751 |
| 1920 | 7 | — | #3,701 |
| 1919 | 18 | — | #1,852 |
| 1918 | 21 | — | #1,689 |
| 1917 | 7 | — | #3,442 |
| 1916 | 7 | — | #3,388 |
| 1914 | 7 | — | #2,815 |
| 1913 | 5 | — | #3,104 |
| 1912 | 5 | — | #2,778 |