| 453 | GALE | Cornwall / Devon border | 18C | |||||
| 092 | GANAWAY | London | c1822 | |||||
| 205 | GARLAND | Minster | pre1864 | |||||
| 542 | GARLAND | Linkinhorne | 17,18&19C | |||||
| 542 | GEAK | Roche / Mevagissey | 18-18C | |||||
| 551 | GIBBS | Bray, Berkshire | 19C | |||||
| 445 | GILES | St. Buryan | pre1765 | |||||
| 636 | GILLETT | Somerset | All | |||||
| 205 | GILMAN | Margate, Kent | c1665 | |||||
| 453 | GIST | Lezant | 1600+ | |||||
| 722 | GLANVILLE | Newlyn | pre1837 | |||||
| 071 | GOLDSWORTHY | Camborne | 1700-1800s | |||||
| 600 | GOLDSWORTHY | Wendron | 1600-2002 | |||||
| 660 | GOLDSWORTHY | Cornwall | All | |||||
| 453 | GOLLY | Gorran | All | |||||
| 051 | GOODBODY | Norwich / London | 1700-1800s | |||||
| 205 | GOODMAN | Lidlington, Bedfordshire | 1600+ | |||||
| 205 | GRANT | Margate, Kent | c1600 | |||||
| 205 | GRAY | Margate, Kent | c1643 | |||||
| 205 | GREASLEY | Marston Moretaine | 1700+ | |||||
| 539 | GREEN | Paul/St.Buryan | All | |||||
| 539 | GREEN | Penzance/Paul | All | |||||
| 303 | GREENWOOD | Devon | c1800 | |||||
| 710 | GREENWOOD | All North Cornwall | pre1700 | |||||
| 195 | GRENFELL | St. Just in Penwith | pre1892 | |||||
| 195 | GROSE | Egloshayle / St. Kew | pre1815 | |||||
| 540 | GROSE (William) | Truro | c1819 | |||||
| 661 | GROSE | Luxulyan | c1780 | |||||
| 666 | GROSE | Gorran | 18-19C | |||||
| 453 | GUEST | Lezant / Stoke Climsland | 1800+ | |||||
| 453 | GUEST | Tresmere | 1800+ | |||||
| 453 | GUIST | Lezant / Stoke Climsland | 1600+ | |||||
| 605 | GULLY | Cornwall | All | |||||
| 445 | GUNDRY | Worldwide | All | |||||
| 445 | GUNDRY | Perranuthnoe | 1775+ | |||||
| 445 | GUNDRY | Sithney | All | |||||
| 367 | GUNN | Kea | 17-19C | |||||