[2][4] Elwyn Gwyther's birth was registered in Gower Peninsula district, Wales.
Gwyther played prop in Belle Vue Rangers' 7–10 defeat by Wigan in the 1947 Lancashire Cup Final during the 1947–48 season at Wilderspool Stadium, Warrington on Saturday 1 November 1947.
[7] Elwyn Gwyther represented Wales XV (RU) while at Llanelli RFC in the 'Victory International' non-Test match(es) between December 1945 and April 1946, and won caps for Wales (RL) while at Belle Vue Rangers, and Leeds 1947–1953 15-caps, and won caps for Great Britain (RL) while at Belle Vue Rangers in 1947 against New Zealand (2 matches), in 1950 against Australia (3 matches); and in 1951 against New Zealand.
[2] Six rugby league footballers represented Wales XV (RU) while at rugby league clubs, they were; Tyssul Griffiths, Elwyn Gwyther, Gomer Hughes, Hugh Lloyd-Davies, Harold Thomas and Leslie Thomas.
Gomer Hughes, and Harold Thomas had previously won Wales (RU) caps, but the other footballers hadn't, and having already changed to the rugby league code they were unable to do so, but Tyssul Griffiths, Elwyn Gwyther, Leslie Thomas, did go on to win Wales (RL) caps.