The baby name Dortha appears in baby name data for the United States from 1911 to 1956. It was most popular in 1921 with 375 babies given the name.
In the later years of this period, Dortha has become less common than it once was.
| Year | Count |
|---|---|
| 1911 | 52 |
| 1912 | 95 |
| 1913 | 77 |
| 1914 | 103 |
| 1915 | 162 |
| 1916 | 192 |
| 1917 | 264 |
| 1918 | 207 |
| 1919 | 262 |
| 1920 | 285 |
| 1921 | 375 |
| 1922 | 276 |
| 1923 | 310 |
| 1924 | 299 |
| 1925 | 316 |
| 1926 | 277 |
| 1927 | 278 |
| 1928 | 214 |
| 1929 | 226 |
| 1930 | 212 |
| 1931 | 170 |
| 1932 | 179 |
| 1933 | 144 |
| 1934 | 133 |
| 1935 | 147 |
| 1936 | 129 |
| 1937 | 89 |
| 1938 | 72 |
| 1939 | 74 |
| 1940 | 59 |
| 1941 | 55 |
| 1942 | 57 |
| 1943 | 67 |
| 1944 | 17 |
| 1945 | 45 |
| 1946 | 19 |
| 1947 | 32 |
| 1949 | 10 |
| 1950 | 19 |
| 1952 | 10 |
| 1954 | 7 |
| 1955 | 12 |
| 1956 | 5 |