The baby name Masako appears in baby name data for the United States from 1911 to 1934. It was most popular in 1919 with 70 babies given the name.
In the later years of this period, Masako has become less common than it once was.
| Year | Count |
|---|---|
| 1911 | 12 |
| 1912 | 20 |
| 1913 | 30 |
| 1914 | 40 |
| 1915 | 42 |
| 1916 | 48 |
| 1917 | 36 |
| 1918 | 48 |
| 1919 | 70 |
| 1920 | 48 |
| 1921 | 52 |
| 1922 | 52 |
| 1923 | 38 |
| 1924 | 32 |
| 1925 | 20 |
| 1926 | 24 |
| 1927 | 34 |
| 1928 | 24 |
| 1929 | 30 |
| 1930 | 18 |
| 1931 | 12 |
| 1932 | 12 |
| 1933 | 16 |
| 1934 | 14 |