Masaru is a rare boys' name that was most common in the 1910s and has all but disappeared.
Masaru is a boy name. It last appears in U.S. records in 1992. Masaru was first reported in SSA data in 1912 and peaked in 1917 (31 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 1992 | 5 | — | #9,336 |
| 1943 | 5 | — | #3,865 |
| 1942 | 5 | — | #3,887 |
| 1936 | 6 | — | #3,405 |
| 1935 | 5 | — | #3,981 |
| 1933 | 9 | — | #2,664 |
| 1932 | 9 | — | #2,774 |
| 1931 | 11 | — | #2,419 |
| 1930 | 8 | — | #3,189 |
| 1929 | 21 | — | #1,651 |
| 1928 | 19 | — | #1,802 |
| 1927 | 17 | — | #2,007 |
| 1926 | 27 | — | #1,424 |
| 1925 | 29 | — | #1,383 |
| 1924 | 30 | — | #1,370 |
| 1923 | 23 | — | #1,626 |
| 1922 | 21 | — | #1,739 |
| 1921 | 29 | — | #1,407 |
| 1920 | 29 | — | #1,371 |
| 1919 | 18 | — | #1,853 |
| 1918 | 17 | — | #1,965 |
| 1917 | 31 | — | #1,232 |
| 1916 | 19 | — | #1,676 |
| 1915 | 19 | — | #1,642 |
| 1914 | 18 | — | #1,475 |
| 1913 | 6 | — | #2,686 |
| 1912 | 11 | — | #1,588 |