The baby name Mamoru appears in baby name data for the United States from 1916 to 1932. It was most popular in 1924 with 28 babies given the name.
Over the period shown, Mamoru has stayed at a similar level of popularity.
| Year | Count |
|---|---|
| 1916 | 14 |
| 1917 | 10 |
| 1920 | 14 |
| 1921 | 10 |
| 1922 | 14 |
| 1923 | 14 |
| 1924 | 28 |
| 1925 | 22 |
| 1926 | 22 |
| 1927 | 22 |
| 1928 | 14 |
| 1929 | 12 |
| 1932 | 16 |