The baby name Winthrop appears in baby name data for the United States from 1911 to 1954. It was most popular in 1920 with 21 babies given the name.
In the later years of this period, Winthrop has become less common than it once was.
| Year | Count |
|---|---|
| 1911 | 5 |
| 1912 | 10 |
| 1914 | 9 |
| 1915 | 20 |
| 1916 | 10 |
| 1917 | 10 |
| 1918 | 14 |
| 1920 | 21 |
| 1921 | 9 |
| 1922 | 9 |
| 1923 | 13 |
| 1924 | 8 |
| 1925 | 5 |
| 1926 | 11 |
| 1927 | 9 |
| 1928 | 13 |
| 1930 | 6 |
| 1931 | 13 |
| 1933 | 6 |
| 1934 | 8 |
| 1938 | 5 |
| 1943 | 7 |
| 1945 | 5 |
| 1946 | 5 |
| 1948 | 15 |
| 1949 | 6 |
| 1952 | 6 |
| 1954 | 6 |