- Genealogy Register - lists links to personal family histories, and features message boards for discussion.
- Grant / Campbell
- Gentner - also Amann, Brooks, Jonas, Kidney, Nenno, Seider, Smith, Stewart, Winter, and others.
- Gowdy - traces the history of the Gowdy-Goudy family name.
- Garriott - shows Garriott ancestry using linked family trees and lists of descendants. Includes surname and heraldry information.
- Gregor - includes the clan's history, genealogy, and tartans.
- Gemmell / Walker - covering seven generations from Ayrshire, Scotland, and Lanark Co., Ontario.
- Gilders - features information on the Gilders surname in the U.K. and U.S.
- Giesing / Bauer / Doerr - also Hobelmann, Kriege, Otten, Reymer, and Townley.
- Gliedman - source for Gliedman family research and the Gliedman family tree project.
- Grimaldi - provides reference material on the history and genealogy of the House of Grimaldi.
- Goyetche - traces its ancestry to Jean Goyetche, a fisherman born in 1763 in Bayonne, France. Today, Jean's descendants number almost 1,000.
- Greathouse - central resource for information gathered by the Greathouse Cousin Network. Includes archives, researcher list, and database.
- Gehling - midwestern branch of the family as told in the biographies and lineages of six firstborn sons.
- Gordon
- Gilmartin
- Grant - history of the genealogy of the family from their arrival in Ireland to the present day.
- Garrison - includes Ahnentafels for Norman and Garrison lineages.
- Grunwald - dedicated to bringing the worldwide Grunwald family together
- Gritton
- Gingell - history, index, links and more for the Gingells.
- Goodson - records available include census, birth, deaths, cemetery, and marriage.
- Graham - dozens of family surnames covering nearly 2000 years. Includes: Briggs, Coker, Demler, Gates, Graham, Hurley, Kerby, Larimore, Printz, Renz, Short, Woodard, and many more.
- Gagné / Dumontier
- Grubb - also Brashears, Dyer, Fowler, Marshall, Jones, Kiesel, Gower, Henry, Doyle, and Varnell.
- Goad - tool for genealogy and for communications associated with genealogy.
- Goonan - provides historical family information as well as links to related sites.
- Glendinning
- Gardner - genealogy for the surnames Gardner, Smith, Hazelgrove, McCoy, McGinley, Coffey, Stratton, Fisher, and others
- Gibbs
- Goosen - about the family tree.
- Glanville - including the surnames: Allen, Ball, Barnett, Chantler, Cheesman, Couchman, Crewys, Cropp, Early, Fish, Ford and Francis.
- Girdler - history and the coat-of-arms of Bland, Dalton, Daulton,Girdley, Girtley, etc.
- Glendinning
- Giering - alternate spellings include Gühring and Guehring.
- Glenister - family history and worldwide one name study.
- Geyer - from Buffalo, Erie Co., NY.
- Gigliotti - in English and Italian.
- Gebauer - features links, personal interests, hobbies, and a meeting place for all Gebauers.
- Goble - Thomas Goble (1590/91-1657) of West Sussex, England.
- Gootee
- Gasser - compilation of historical information.
- Gryder
- Gaal / Gael
- Goetzman / Götzman - resource for descendents around the world to share information, post reunions, share pictures and stories, and exchange historical information and research data.
- Graves - of the Southeastern United States.
- Gravitt - and all variants, including descendant charts, census & marriage records.
- Gresko - Genealogy on Kimble, Hollands, Call, Greenfield and Scott. Index of names, historical photos, journals pages from late 1800s in PA.
- Goodling / Woods - also including: Boone, Van Tassel, Wightman, Opden Dyck, Edwards, Perry, Lenfest, Montauk, Glen, Wilson, and more.
- Gourdin - history and genealogy of the Gourdin/Gourdine Family from South Carolina, 1830-present.
- Gregorich - building the branches and connecting the links for the family.
- Gabbert / Giancola - research includes the surnames: Balnek, Cheatham, Comstock, Covington, Fick, Finley, Hunt, Pack, Pohls, Prince, Vance, Welzmueller and several others.
- Gette - genealogy of Gette, Barton, Koenig, Cole, Schuch, and Ahrens families.
- Gaines - family tree back to 1500's. Alternate spellings and other surnames include: Gasnier, Gagnier, Gagne, Gonyea, Marcroft, and Howard.
- Gaskins - family tree from 1589.
- Gix - also: Groh, Morey, Trepp and Fimian surnames.
- Gorvett - family history of Gorvetts, Gorveatts, Gorveattes, and Gorretts throughout the world.
- Gammell - provides information on Gammell family overview, ancestors, names, and family tree.
- Gaubert - traces the line of Edward Gaubert, born in 1704.
- Genter / Martin - including the surnames: Beard, Bergameister, Blessington, Brown, Davidson, Duleaw, Grosea, and others.
- Gillies
- Golden / Tams / Meehan
- Grace
- Grange - other surnames include: Jensen, Swett, Wright, Christensen, Wilcox, Harkness, Diaz, Anderson, Thornton, Rocks, Andreasen, Boone, Wilson, Iversen, Andersen, Sullivan, Pedersen, Lopez and Dominguez.
- Gleesons - contains a history of the Gleeson sept and the emergence of surnames in Ireland.
- Gullett - genealogical information.
- Gerken - also includes Schulte, Winter, Schumacher, Uthe, Kieler, Larson, and Nyborg.
- Gorrell - includes the families of Nehemiah, Taylor, Lemmon, Lowe, Wray, Ray, Heath, Peck, Ater, Webb, Tarchala, and Dzik.
- Grimason - features baptisms, births, marriages, and deaths featuring the surname and its variations.
- Geary - meet an 11th century knight; a French Freebooter and an Irish killer who became a Texas millionaire.
- Gindlesperger - researching the history, traditions, and lore of the descendants of Ulrich Gindlesperger, who arrived in America from Rotterdam on September 15, 1749
- Green - also Bryant, Harris, Watson, Weeden, and Masters.
- Grissom - descendants of John Tolliver and Florence Martha Haston Grissom.
- Garst - alternate spellings include Gerst and Gharst.
- Galleymore
- Genkel - shares genealogical research on the roots of the Genkel family.
- Guckel - dedicated to the research of the surname.
- Grimshaw - traces the family line from 1300 AD to the present day.
- Garbe - includes the names Knoblauch, Bursian, Knorn, Tarneski, Thielemann, Augstein, Knoeffler, Krieg, and Kasior, involving the locations of Florlauken, Bernburg, Krauschuetz, and Silesia in Germany.
- Girling - areas for origin of this name include Norfolk and Suffolk, in England.
- Greb / Wiser - also including Steinke and Thompson genealogy.
- Gresse
- Gallihugh - genealogical history of the family.
- Golton - provides information about the Golton surname and the location and origins of families with the Golton, Goulton, Galton, Gaulton and Golten names.
- Gadeck Genealogy researching surnames of GADEK, KORBUT, DZIEDZIC, STOKLOSA and WLODARCZYK families from the village of Targowisko, Poland
- Gadley; Darlene Gadley's Genealogy Page features genealogy research on Nez Perce genealogy and family lines for the Spear Family, Duhig Family, Sanders Family, Armour Family, Callihan Family, Gadley Family, Nelson & Jensen Families
- Garlitz; Christian Garlitz Family History family tree and history of the Garlitz family of Greenville Township, Pennsylvania and Avilton, Maryland
- Gay; Gay Crawford Genealogy Legacy researching Crawford and Gay surnames
- Gillott Family History Genealogy of the GILLOTT surname from Sheffield, England
- Gimenez; Genealogia de la familia Giminez (Spain) researching the surname of Gimenez
- Geoff's Genealogy researching Bankes surname (originally of London 1652) , also Collyer and Hunt surnames
- Gillette Genealogy genealogical and historical material associated with the surname Gillette, and variants such as Gillett, Gilet, etc
- Goodrich Family Organization researching Goodrich, Goodridge, Hatley, Thompson, Ray, Merrell, Merrill, Reiber, Reuber, Adler and Hoffman surnames
- Goslett One-Name Study and variants; Goslet, Gooslet, Gorslet, Gostlet, Goslit, Gaslett, Goselet and Goslette
- Graber; Betty's Genealogies researching HARTZLER; Amish-Mennonite and GRABER; Swiss Volhynian (Russian) Mennonite families
- Granger Family History John Martin Granger -- 1760/1840 and the branches of his thirteen children
- Greathead Family One Name Study researching Greathead and variants Greatheed, Greathed, Greethead, Grethed, Greated
- Grim Family Chronicles from Ross and Fayette counties, Ohio
- Gronow One-Name Study researching Gronow and Gronnow surnames
- Gunton Family History Gunton Family in Norfolk, England; mainly Mattishall and Shipdham