The baby name Tadashi appears in baby name data for the United States from 1912 to 1935. It was most popular in 1917 with 42 babies given the name.
In the later years of this period, Tadashi has become less common than it once was.
| Year | Count |
|---|---|
| 1912 | 10 |
| 1913 | 18 |
| 1914 | 16 |
| 1915 | 12 |
| 1916 | 24 |
| 1917 | 42 |
| 1918 | 18 |
| 1919 | 26 |
| 1920 | 34 |
| 1921 | 33 |
| 1922 | 42 |
| 1923 | 30 |
| 1924 | 36 |
| 1925 | 30 |
| 1926 | 20 |
| 1927 | 28 |
| 1928 | 16 |
| 1929 | 14 |
| 1930 | 16 |
| 1931 | 16 |
| 1932 | 12 |
| 1933 | 12 |
| 1934 | 14 |
| 1935 | 14 |