Yaccarino
- Ancestors of Anastassia Yaccarino, compiled by Thomas Louis Yaccarino, NJ USA. Includes surnames Curto, Arcipane, Bellia, D'Amico and Archangelo of Sicily, and Gregorace and Nistico from Calabria, Italy.
- http://familytreemaker.genealogy.com/users/y/a/c/Thomas-Louis-Yaccarino/

Yoder Family Information: USA
- Documenting North American lineages with European connections. Includes newsletters, court and census records, Amish and non-Amish branches, plus information from European researchers.
- http://www.yodernewsletter.org/

Yeo Name Society
- Official UK registered one name society researching and recording the history of the Yeo family worldwide. Includes pedigrees, coat of arms, biographies and roll of honour.
- http://www.yeosociety.com/

Yalden Family
- Information on all known living Yaldens and their offspring, worldwide. Includes detailed history and pedigrees.
- http://www.yaldenfamily.net/

Yaffe of South Africa
- Family history of Sarah Yaffe, nee Mandel from Liverpool England to Cape Town, circa 1913. Compiled by Jack Yaffe.
- http://www.genealogy.com/genealogy/users/y/a/f/Jack-Yaffe-Boksburg/

Yaedke
- Family tree of Gerald Yaedke, focusing on the areas of Green Bay, Wisconsin and Winona, Minnesota USA.
- http://familytreemaker.genealogy.com/users/y/a/e/Gerald-Yaedke/index.html

Yadoff and Piekarsky
- Ancestral research undertaken by Andrew Seth Yadoff, Wyckoff, New Jersey USA.
- http://familytreemaker.genealogy.com/users/y/a/d/Andrew-S-Yadoff/index.html

Yacinski
- Family tee compiled by Rebecca Leigh Yacinski, Winchester, CT USA.
- http://familytreemaker.genealogy.com/users/y/a/c/Robin-L-Yacinski/index.html

Yacup
- Family history of Betty JoAnn Hill Yacup. Includes surname index and family tree.
- http://familytreemaker.genealogy.com/users/y/a/c/Betty-J-Yacup-CO/

Yabsley
- Ancestral research including spelling variants Yeabsley and Yebsley. Compiled by Michael John Yabsley, Ridgeway, SC USA.
- http://familytreemaker.genealogy.com/users/y/a/b/Michael-J-Yabsley/

Yarmovsky Family History
- Ancestors and descendants of Shmuel David Yarmovsky 1840-1930 and Hene Silverstein 1848-1941, compiled by Gregory Kolojeski.
- http://www.yarmovsky.info/

Yeakel Family
- Ancestral history of Philip Ludwig Yeakel and Maria Elizabeth Hohn, immigrated to US from Sonnenberg, near Wiesbaden, German, 1836. Includes photographs and spelling variations of Jeckel, Yakel and Jackel.
- http://www.yeakel.com/

Yelverton
- Researching descendants of John Yelverton 1680-1750, NC USA. Includes the Yelvington and Elvington families of America. Compiled by Keith E Yelverton.
- http://webpages.charter.net/kvcw/

Yarbrough Archives
- Descendants of John Swanson Yarbrough, including Tope and Moore lineages. Compiled by Renee Pierce Smelley.
- http://freepages.history.rootsweb.com/~yarbrough/

Yacobelli
- Family tree compiled by Lawrence Alexander Yacobelli Snr.
- http://www.genealogy.com/genealogy/users/y/a/c/Lawrence-A-Yacobelli-sr/index.html