The baby name Ethelyn appears in baby name data for the United States from 1910 to 1951. It was most popular in 1917 with 136 babies given the name.
In the later years of this period, Ethelyn has become less common than it once was.
| Year | Count |
|---|---|
| 1910 | 5 |
| 1911 | 19 |
| 1912 | 25 |
| 1913 | 26 |
| 1914 | 46 |
| 1915 | 120 |
| 1916 | 96 |
| 1917 | 136 |
| 1918 | 87 |
| 1919 | 65 |
| 1920 | 123 |
| 1921 | 91 |
| 1922 | 87 |
| 1923 | 91 |
| 1924 | 77 |
| 1925 | 80 |
| 1926 | 67 |
| 1927 | 84 |
| 1928 | 79 |
| 1929 | 41 |
| 1930 | 35 |
| 1931 | 28 |
| 1932 | 41 |
| 1933 | 17 |
| 1935 | 6 |
| 1937 | 16 |
| 1938 | 18 |
| 1941 | 5 |
| 1942 | 11 |
| 1943 | 5 |
| 1947 | 8 |
| 1951 | 6 |