| Gadsby (G321) | Lincolnshire | 1690 | 1890 | hermitpez |
| Gadsby (G321) | Warwickshire | 1780 | 1900 | Guinevere |
| Galbreath, Galbraith (G416) | Argyll | 1750 | | JBee |
| Gambrill (G516) | | | | Gordon |
| Gardner / Gardiner / Gardener / Garner / Garnar (G635) | Swalcliffe, Oxfordshire, UK | 1756 | 1875 | Christine in Herts |
| Garner (G656) | Barnoldswick, Yorkshire | 1871 | 1925 | Jill |
| Garner (G656) | Fillongley, Warwickshire | | | Mary from Italy |
| Garner (G656) | Lowestoft | 1800 | 1900 | Guinevere |
| Garner (G656) | Stamford, Lincolnshire | 1730 | 1870 | Jill |
| Garrettson (G632) | Portland, Oregon USA and Indiana USA | 1870 | 1906 | MacPanda |
| Garside (G623) | Elland/Rishworth, Yorkshire | 1750 | 1769 | |
| Gash (G200) | Lincolnshire and Co Durham | | | JayG |
| Gawthorp, Gauthrop and Variants (G361) | Upton cum Kexby and Hemswell, Lincolnshire | 1670 | 1730 | ElizabethHerts |
| Genn (G500) | Derbyshire | 1700 | 1800 | Gert in Oz |
| German (G655) | Ashby De La Zouch, Leicestershire | 1800 | 1940 | Tom Tom |
| Gibb (G100) | Tulliallan Scotland | 1700 | 1800 | Janet Chiltern Borders |
| Gibbons (G152) | Berkshire | | | Carolyn P |
| Gibbs (G120) | Devon - Tiverton | 1840 | 1940 | Langley Vale Sue |
| Gibson (G125) | Culross Scotland | 1600 | 1900 | Janet Chiltern Borders |
| Gilbert (G416) | Beds | 1640 | 1670 | Oakum Picker |
| Gilbert (G416) | Sparsholt, Hampshire | 1600 | 1850 | marquette |
| Gildart (G436) | Alrewas, Staffordshire | 1750 | 1830 | Merry |
| Gill (G400) | Cocking, Sussex | 1650 | 1740 | ElizabethHerts |
| Gilmour (G456) | Dalserf, Ayrshire | 1750 | 1780 | Shona |
| Glanville (G451) | PORTSMOUTH+WALES | 1850 | 1980 | China |
| Glazebrook (G421) | Halam | | | mares |
| Glazier (And Variant Spellings) (G426) | Fernhurst, Sussex | 1750 | 1880 | Jill |
| Gleaves (G412) | Lancashire | | | Hopeful |
| Glew (G400) | Surrey | 1880 | 2000 | Ray Gloster |
| Gliddon (G435) | adelaide | 1800 | 1900 | Bazza |
| Gloster (G423) | Birmingham | 1760 | 1850 | Ray Gloster |
| Gloster (G423) | London | 1840 | 2000 | Ray Gloster |
| Glover (G416) | Kingsbury Episcopi, Somerset | 1700 | 1800 | marquette |
| Glyde (G430) | London/Ispwich | | | SueinKent |
| Goadby (G310) | Leicestershire | | | Anstey Nomad |
| Goffee (G100) | Middlesex | | | Nona |
| Goldring (G436) | Madehurst, Sussex | | | Jill |
| Goldsborough (G432) | Kent | 1880 | 1900 | Merry |
| Goldsborough (G432) | Shoreditch, Middlesex | 1860 | 1870 | Merry |
| Goldsmith (G432) | Southwold and area | 1690 | 1947 | maryphil |
| Goodenough (G352) | Landbeach, Witcham,Haddenham, Cambridgeshire | 1600 | 1850 | marquette |
| Goodman (G355) | Edgbaston, Warwickshire | 1850 | 1920 | Merry |
| Goodman (G355) | Northamptonshire | | | Carolyn P |
| Goodrich (G362) | St James, Suffolk, England | 1425 | 1755 | Moonlightflower |
| Goond (G530) | Rutland | 1790 | 1850 | Margaret in Burton |
| Goostrey (G236) | Ashby de la Zouch, Leicestershire | 1730 | | Margaret in Burton |
| Gorbel (G614) | Norfolk | 1680 | 1750 | Oakum Picker |
| Gordon (G635) | Cabrach Parish, Australia | 1700 | 2000 | HarrysMum |
| Gordon (G635) | Wales, Scotland, Australia | | | Zoemcdougall |
| Gorringe, Goring (G652) | Middlesex, London | 1731 | | |
| Gosden (G235) | Australia | 1890 | 1930 | Merry |
| Gosden (G235) | Isleworth, Middlesex | 1860 | 1900 | Merry |
| Goslemore (G245) | Madehurst, Sussex | | | Jill |
| Gough (G200) | Derbyshire and Leicestershire | 1800 | 1900 | Gert in Oz |
| Gowen (G500) | Suffolk | 1650 | 1850 | Guinevere |
| Gowing (G520) | Suffolk, Norfolk | 1650 | 1830 | Oakum Picker |
| Graham (G650) | Glasgow | 1796 | 1861 | Tisnoti |
| Grant (G653) | Australia | 1830 | 2000 | HarrysMum |
| Grant (G653) | Cabrach Parish, Scotland | 1650 | 1900 | HarrysMum |
| Gratton (G635) | Derbyshire | 1750 | 1950 | Gert in Oz |
| Graves (G612) | Saltfleetby, Lincolnshire | 1700 | 1900 | Tom Tom |
| Gray (G600) | Australia, NSW - Inverell, Tamworth, Sydney | 1839 | 1950 | |
| Gray (G600) | Lancashire - Prestwich | 1817 | 1838 | |
| Gray (G600) | Norfolk | 1750 | 1911 | Nell |
| Greaves (G612) | | 1836 | 1871 | RayG |
| Green (G650) | Derbyshire | 1700 | 1900 | Gert in Oz |
| Green (G650) | Derbyshire and Ireland | 1800 | 1900 | Gert in Oz |
| Green (G650) | Gawsworth, Cheshire | 1560 | 1900 | Olde Crone |
| Green (G650) | Somerset & Gloucestershire | | | Nona |
| Green (G650) | Wantage, Berkshire | | | Carolyn P |
| Green (G650) | Warwickshire | 1800 | 2000 | toneil461 |
| Greenall (G654) | Lancashire | | | widfarend |
| Greentree (G653) | Ben Lomond, Elsmore, Tamworth, Wilberforce, NSW | 1820 | 1970 | |
| Greentree (G653) | Harting, Sussex | 1660 | 1820 | |
| Gregory (G626) | Blyth, Northumberland | 1860 | 1940 | Tom Tom |
| Gregory (G626) | Drogheda, Louth, Ireland | | | Mary from Italy |
| Gregory (G626) | Normanton, Yorkshire | 1880 | 1960 | Tom Tom |
| Gregory (G626) | Quorndon, Mountsorrel and Barrow-on-Soar, Leicestershire | | | Mary from Italy |
| Greig (G620) | Auchterderran, Fife | 1780 | 1810 | Shona |
| Greig (G620) | Pathhead, Scotland | | 1839 | j9diabolo |
| Grenland (G654) | Chew Magna, Somerset | 1650 | 1730 | Merry |
| Gresham (G625) | Kirkby on Bain area, Lincolnshire | 1650 | 1700 | ElizabethHerts |
| Grieves (G612) | | 1836 | 1871 | RayG |
| Griffin (G615) | Hinckley, Leicestershire | 1770 | | Margaret in Burton |
| Grigor (G626) | Glasgow, Scotland | 1906 | 1994 | Jill |
| Grimshaw (G652) | Isle of Man/Lancashire | 1700 | 1900 | Olde Crone |
| Grimshaw (G652) | Manchester, Lancashire | | | Mary from Italy |
| Groom (G650) | Herts | 1740 | 1810 | Oakum Picker |
| Grose/Grosse (G622) | St Enoder, Cornwall | 1600 | 1750 | ElizabethHerts |
| Grout (G630) | Buntingford, Puckeridge, Braughing, Hertfordshire | 1750 | 1850 | Merry |
| Grout (G630) | Enfield, Tottenham, Middlesex | 1750 | 1880 | Merry |
| Grout (G630) | Middlesex | 1660 | 2019 | Jenthec |
| Groves (G612) | South Africa | 1850 | 2014 | loudoniii |
| Gruber (G616) | Middlesex, England | 1865 | 1950 | ard |
| Gruenberger (G651) | | | | bethanyleigh |
| Grundon (G653) | Herts Beds | 1650 | 1800 | Oakum Picker |
| Gullock (G420) | Bristol | | | Nona |
| Gumbert (G516) | Canada, Ontario | 1850 | 1950 | Langley Vale Sue |
| Gunnell (G540) | Twyford Berkshire | 1600 | 1750 | marquette |
| Gunning (G552) | Somerset | | | Nona |
| Gurney (G650) | Lowestoft | 1750 | 1850 | Guinevere |
| Gurteen (G635) | Haverhill, Suffolk | 1850 | 1900 | Merry |
| Guy (G000) | Bottesford,Leics.: Nottingham | | | Ann from Sussex |