Born in Monmouthshire, Wales, United Kingdom (Trevethin).1

Check of BMD Database for George COBBETT born between 1837 (Earliest dates available) and 1855 fails to find a match

Check of BMD Database for George CoRbett born between 1837 and 1855 in Monmouthshire finds 2 possible matching records:
George James Corbett born in Hereford Dec 1851 (least likely)
George Corbett born Pontypool Dec 1852 (Best Match)

Census 1851 Shows Parents are named COBBERTT [[Latitude/Longitude: 51°42'41.47"N, 3°3'24.1"W]]

Trevethin

[[Latitude/Longitude: 51°42'41.47"N, 3°3'24.1"W]]

Married Sarah Jane DAVIES in Monmouthshire, Wales, United Kingdom.3

[[Latitude/Longitude: 51°42'41.47"N, 3°3'24.1"W]]

Death of Sarah Jane DAVIES in Monmouthshire, Wales, United Kingdom

Died in Monmouthshire, Wales, United Kingdom (Pontypool).2

[[Latitude/Longitude: 51°41'37.2"N, 3°2'30.51"W]]