- (NZ) (AU) Jack
 - Jack/Beaumont emigrated to New Zealand c1870. Researching Brown, Burgess, Hayes, Perriam lines, and more. - (AU) Judie's Genealogy
- Contains my Aussie family tree with ancestors also from the U.K., USA and New Zealand.
- Jablonowski
- Jackson (3)
- Jacobs
- Research on Jacobs and Lear families of Australia, England, and Denmark.
- Jaeger
- Traces the family tree from its origin in Alsace, starting in 1676.
- Jankowski
- Genealogy of the Jankowskis in the USA. Includes branches of Sullivan, Cherveny, Marshall, and Dark.
- Jennings (1)
- Jeremiah
- Tracing the family from Carmarthenshire and Cardiganshire in South Wales.
- Jesenovec
- Slovenian genealogy.
- Johnson (2)
- Johnston
- Features membership, merchandise, and more for researchers of Johnston or Johnstone heritage.
- Jones (2)
- Josey
- Tracing the Josey family origins in Aldworth, U.K. circa 1640 to the present day worldwide.
- Joy
- Line of descent from Thomas Joy & Joan Gallup.
- Judkins
- For people researching the surname Judkins and their associated families.
- Judson
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