Ethlyn is a rare girls' name that was most common in the 1920s and has all but disappeared.
Ethlyn is a girl name. It last appears in U.S. records in 1958. Ethlyn was first reported in SSA data in 1884 and peaked in 1921 (34 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 1958 | 5 | — | #6,375 |
| 1954 | 6 | — | #5,340 |
| 1951 | 6 | — | #5,020 |
| 1950 | 7 | — | #4,437 |
| 1949 | 7 | — | #4,364 |
| 1948 | 7 | — | #4,320 |
| 1945 | 11 | — | #2,790 |
| 1944 | 9 | — | #3,207 |
| 1943 | 12 | — | #2,744 |
| 1942 | 7 | — | #3,859 |
| 1941 | 10 | — | #2,895 |
| 1940 | 8 | — | #3,305 |
| 1939 | 7 | — | #3,553 |
| 1938 | 6 | — | #3,984 |
| 1937 | 10 | — | #2,796 |
| 1936 | 8 | — | #3,199 |
| 1935 | 15 | — | #2,133 |
| 1934 | 12 | — | #2,468 |
| 1933 | 13 | — | #2,311 |
| 1932 | 7 | — | #3,686 |
| 1931 | 13 | — | #2,342 |
| 1930 | 24 | — | #1,628 |
| 1929 | 22 | — | #1,728 |
| 1928 | 17 | — | #2,120 |
| 1927 | 12 | — | #2,758 |
| 1926 | 24 | — | #1,741 |
| 1925 | 21 | — | #1,911 |
| 1924 | 19 | — | #2,081 |
| 1923 | 18 | — | #2,115 |
| 1922 | 24 | — | #1,745 |
| 1921 | 34 | — | #1,382 |
| 1920 | 27 | — | #1,597 |
| 1919 | 21 | — | #1,816 |
| 1918 | 22 | — | #1,772 |
| 1917 | 25 | — | #1,519 |
| 1916 | 27 | — | #1,417 |
| 1915 | 24 | — | #1,491 |
| 1914 | 17 | — | #1,619 |
| 1913 | 17 | — | #1,424 |
| 1912 | 13 | — | #1,560 |
| 1911 | 11 | — | #1,485 |
| 1909 | 11 | — | #1,316 |
| 1908 | 6 | — | #1,934 |
| 1905 | 8 | — | #1,462 |
| 1903 | 5 | — | #1,889 |
| 1902 | 5 | — | #1,878 |
| 1901 | 6 | — | #1,542 |
| 1900 | 6 | — | #1,798 |
| 1896 | 5 | — | #1,661 |
| 1895 | 5 | — | #1,679 |
| 1884 | 5 | — | #1,077 |