Masako is a rare girls' name that was most common in the 1920s and has all but disappeared.
Masako is a girl name. It last appears in U.S. records in 1993. Masako first appears in 1909 and peaked in 1921 (58 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 1993 | 5 | — | #14,915 |
| 1976 | 7 | — | #7,806 |
| 1971 | 5 | — | #9,118 |
| 1943 | 5 | — | #5,121 |
| 1940 | 5 | — | #4,814 |
| 1937 | 9 | — | #3,087 |
| 1936 | 7 | — | #3,604 |
| 1935 | 12 | — | #2,528 |
| 1934 | 17 | — | #1,972 |
| 1933 | 13 | — | #2,361 |
| 1932 | 10 | — | #2,975 |
| 1931 | 14 | — | #2,269 |
| 1930 | 27 | — | #1,519 |
| 1929 | 28 | — | #1,473 |
| 1928 | 24 | — | #1,717 |
| 1927 | 37 | — | #1,323 |
| 1926 | 31 | — | #1,473 |
| 1925 | 30 | — | #1,526 |
| 1924 | 39 | — | #1,295 |
| 1923 | 39 | — | #1,260 |
| 1922 | 53 | — | #1,041 |
| 1921 | 58 | — | #981 |
| 1920 | 47 | — | #1,098 |
| 1919 | 55 | — | #962 |
| 1918 | 43 | — | #1,145 |
| 1917 | 31 | — | #1,325 |
| 1916 | 36 | — | #1,205 |
| 1915 | 34 | — | #1,182 |
| 1914 | 34 | — | #1,030 |
| 1913 | 34 | — | #921 |
| 1912 | 18 | — | #1,278 |
| 1911 | 8 | — | #1,898 |
| 1909 | 6 | — | #2,147 |