Gwin is a very rare variant of Gwen that was most common in the 1940s and has all but disappeared.
Gwin is predominantly a boy name. It last appears in U.S. records in 1961. Gwin first appears in 1916 and peaked in 1943 (11 births).
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 1961 | 5 | — | #6,931 | — |
| 1960 | 6 | — | #5,946 | — |
| 1959 | 5 | — | #6,606 | — |
| 1954 | 5 | — | — | #4,046 |
| 1953 | 6 | — | #5,275 | — |
| 1952 | 13 | — | #4,644 | #3,513 |
| 1951 | 6 | — | — | #3,510 |
| 1949 | 12 | — | #4,897 | #3,477 |
| 1947 | 6 | — | #4,959 | — |
| 1944 | 8 | — | — | #2,725 |
| 1943 | 16 | — | #4,944 | #2,325 |
| 1941 | 6 | — | #4,148 | — |
| 1940 | 6 | — | — | #3,262 |
| 1939 | 7 | — | — | #2,951 |
| 1936 | 7 | — | — | #2,994 |
| 1935 | 8 | — | — | #2,799 |
| 1933 | 5 | — | — | #3,865 |
| 1932 | 7 | — | — | #3,208 |
| 1931 | 6 | — | — | #3,549 |
| 1930 | 7 | — | — | #3,420 |
| 1928 | 6 | — | — | #3,892 |
| 1925 | 5 | — | — | #4,500 |
| 1923 | 8 | — | — | #3,280 |
| 1920 | 6 | — | — | #4,012 |
| 1919 | 6 | — | — | #3,908 |
| 1916 | 7 | — | — | #3,310 |