- Karlinsey
- Includes name origin and links to family records. - Karr
- Includes genealogical and historical information for the families of John C. Karr and Rev. Thomas Moore, early pioneers of White County, Indiana. Kavanagh
- Overview of the origin and early history of the Kavanagh clan/family.- Kaye
- Traced back to late 1600's in Belgium including the surnames: Capiaux, Gillard, Gerard, Knap, Stordeur, and more. - Kean
- Family tree of the Keans from Bonavista Bay, Flower's Island and Pool's Island, Newfoundland. - Keith (2)
- Kelly (1)
- Kendall
- Documenting the Kendalls from the fifteenth century to the present. Also includes information about the Anderson, Pigman, and Bowen families. - Kenna
- Family tree and photos for the extended family of Kenna, Willette, Averett, Byrd, Cole, and Graves. - Kennamer
- Information about the family, with a special emphasis on their history in North Alabama. - Kennedy / Dennis / Flanagan
- Also Hull, Jarvis, Klahn, Maddy, and more. - Kenyon
- Family genealogy. - Kerchner
- Discusses the ancestry of the family in Lehigh County, (Allentown area), PA. - Kerlin
- Dedicated to researching genealogical information on the family surname. - Kernke
- Researching the descendants of Christian Wilhelm Kernke from Lansberg, Prussia. Also includes the Scheffler, Hebbard, Schroter, Rosanack, Daum, Herfort, Nietke, and Trieves families. Kerry
- Also King, Lukes, and Hutcheon in the counties of Kent, Suffolk, and Norfolk.- Kiblin
 - Kiff
- One name study of the surname including newsletters. - Kilgo
- Devoted to Kilgo families in Georgia, Alabama, and Tennessee. Also includes history of the Kilgore surname. - Kimball
 - Kinkade (1)
- Kinsella
- Contains historical and genealogical information as well as a bulletin board and related links. - Kipnis
- Dedicated to the family's history. - Kirkwood
- Descendents of Alexander Kirkwood (1823-1901). - Kistler
- Includes coat of arms description and general history, photos, and links. - Kitces / Keces / Keses / Kitzes / Kitzis
- Family tree and significant events for the families. Also includes Charest, Pearson, Gordon, Westheimer, Greenwald, Simon, and Rohr. - Kizhanatham
- Dedicated to Kizhanatham V. Athinatha Iyengar and his family history. Includes background on Kizhanatham Village. - Klee / Boock
- Genealogy and family history of the Klee and Boock families in New Zealand. Also with information on the names: Williams, MacLean, Reid, Himes, Foley, and Bennetts. - Kluge
- Information about the Kluge Family in Denmark, Germany and the USA; searching descendants world-wide; links to Danish and German addresses. - Knappenberger
- Spellings include Knuppenburg, Knappenberg, and Knappenburger. - Knippenberg
- Family tree and history of castle Knippenberg. - Knoblauch / Knobloch / Knoblock
- Dedicated to sharing information/queries on these family names. - Koon / Lomax / Quattelbaum
- Lineages for Benedictus Kuhn, William Lomax, Jacob Keller, Henry Dominick and Peter Quattelbaum. - Kreitlow
- Includes names, dates, and family essays. - Krenn
- Fischer, Voiland, Weller, May, Webber, and others. - Kreuser
- Traces the ancestors of John Andrew Kreuser. - Krey
 - Kueber
- Also includes Wade, Rischette, and related families. Kurudamannil
- Traces the origins of the family from the first century.- Kurzweil
 - Kuykendall (1)
- Kuzniewski / Kneski
- Origin of the name, extended family tree, and family history. - Kyler
- Dedicated to Kylers and Kyler genealogy.
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