- Gaal / Gael
 - Gagné / Dumontier
 - Gagnier / Gagne / Gagner (2)
- Galleymore
 - Gallihugh
- Genealogical history of the family. - Gammell
- Provides information on Gammell family overview, ancestors, names, and family tree. - 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. - Gardner
- Genealogy for the surnames Gardner, Smith, Hazelgrove, McCoy, McGinley, Coffey, Stratton, Fisher, and others - Garriott
- Shows Garriott ancestry using linked family trees and lists of descendants. Includes surname and heraldry information. - Garrison
- Includes Ahnentafels for Norman and Garrison lineages. - Garst
- Alternate spellings include Gerst and Gharst. - Gaskins
- Family tree from 1589. - Gasser
- Compilation of historical information. - Geary
- Meet an 11th century knight; a French Freebooter and an Irish killer who became a Texas millionaire. - Gehling
- Midwestern branch of the family as told in the biographies and lineages of six firstborn sons. - Gemmell / Walker
- Covering seven generations from Ayrshire, Scotland, and Lanark Co., Ontario. - Genealogy Register
- Lists links to personal family histories, and features message boards for discussion. - Genkel
- Shares genealogical research on the roots of the Genkel family. - Genter / Martin
- Including the surnames: Beard, Bergameister, Blessington, Brown, Davidson, Duleaw, Grosea, and others. - Gentner
- Also Amann, Brooks, Jonas, Kidney, Nenno, Seider, Smith, Stewart, Winter, and others. - George (2)
- Gerken
- Also includes Schulte, Winter, Schumacher, Uthe, Kieler, Larson, and Nyborg. - Gette
- Genealogy of Gette, Barton, Koenig, Cole, Schuch, and Ahrens families. - Geyer
- From Buffalo, Erie Co., NY. - Gibbs
 - Gibson (1)
- Giering
- Alternate spellings include Gühring and Guehring. - Giesing / Bauer / Doerr
- Also Hobelmann, Kriege, Otten, Reymer, and Townley. - Gilbert (3)
- Gilders
- Features information on the Gilders surname in the U.K. and U.S. - Gilmartin
 - Gindlesperger
- Researching the history, traditions, and lore of the descendants of Ulrich Gindlesperger, who arrived in America from Rotterdam on September 15, 1749 - Gingell
- History, index, links and more for the Gingells. - Girdler
- History and the coat-of-arms of Bland, Dalton, Daulton,Girdley, Girtley, etc. - Girling
- Areas for origin of this name include Norfolk and Suffolk, in England. - Gix
- Also: Groh, Morey, Trepp and Fimian surnames. - Glanville
- Including the surnames: Allen, Ball, Barnett, Chantler, Cheesman, Couchman, Crewys, Cropp, Early, Fish, Ford and Francis. - Gleesons
- Contains a history of the Gleeson sept and the emergence of surnames in Ireland. - Glendinning
 - Glendinning
 - Glenister
- Family history and worldwide one name study. - Gliedman
- Source for Gliedman family research and the Gliedman family tree project. - Goad
- Tool for genealogy and for communications associated with genealogy. - Goble
- Thomas Goble (1590/91-1657) of West Sussex, England. - Godwin (1)
- Goetzman / Götzman
- Resource for descendents around the world to share information, post reunions, share pictures and stories, and exchange historical information and research data. - Golden / Tams / Meehan
 - Golton
- Provides information about the Golton surname and the location and origins of families with the Golton, Goulton, Galton, Gaulton and Golten names. - Goodson
- Records available include census, birth, deaths, cemetery, and marriage. - Goonan
- Provides historical family information as well as links to related sites. - Goosen
- About the family tree. - Gordon
 - Gorrell
- Includes the families of Nehemiah, Taylor, Lemmon, Lowe, Wray, Ray, Heath, Peck, Ater, Webb, Tarchala, and Dzik. - Gorvett
- Family history of Gorvetts, Gorveatts, Gorveattes, and Gorretts throughout the world. - Gourdin
- History and genealogy of the Gourdin/Gourdine Family from South Carolina, 1830-present. - Gowdy
- Traces the history of the Gowdy-Goudy family name. - Goyetche
- Traces its ancestry to Jean Goyetche, a fisherman born in 1763 in Bayonne, France. Today, Jean's descendants number almost 1,000. - Grant / Campbell
 - Graves
- Of the Southeastern United States. - Gravitt
- And all variants, including descendant charts, census & marriage records. - Greathouse
- Central resource for information gathered by the Greathouse Cousin Network. Includes archives, researcher list, and database. - Green (3)
- Greene (1)
- Gregor
- Includes the clan's history, genealogy, and tartans. - Gregorich
- Building the branches and connecting the links for the family. - Gresko
- Genealogy on Kimble, Hollands, Call, Greenfield and Scott. Index of names, historical photos, journals pages from late 1800s in PA. - Gresse
 - Griffin (2)
- Grimaldi
- Provides reference material on the history and genealogy of the House of Grimaldi. - Grimason
- Features baptisms, births, marriages, and deaths featuring the surname and its variations. - Grimshaw
- Traces the family line from 1300 AD to the present day. - Grissom
- Descendants of John Tolliver and Florence Martha Haston Grissom. - Gritton
 - Grubb
- Also Brashears, Dyer, Fowler, Marshall, Jones, Kiesel, Gower, Henry, Doyle, and Varnell. - Grunwald
- Dedicated to bringing the worldwide Grunwald family together - Gryder
 - Guckel
- Dedicated to the research of the surname. - Gullett
- Genealogical information.
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