| Location | Sub-location | Title | Author/Comp./Editor |
| XYZ Families | YAGER | See: I am Because They Were | |
| XYZ Families | YALE | Yale Family or Descendants Of David Yale, New Haven 1850 | |
| XYZ Families | YETTER | Genealogy of Yetter Families Febrary 6, 1932 | |
| XYZ Families | YOUNG | Maine Events in the Young Fanily | |
| XYZ Families | YOUNG | Twenty-seventh Wife | Irving Wallace |
| XYZ Families | YOUNG | Young Family | |
| XYZ Families | YOUNG | Young Family of Dutchess and St. Lawrence Co., NY. | |
| XYZ Families | ZIRKLE | Zirkle Family History*** | Harpine, J. William |
| XYZ Families | ZIMMERMAN | Mohawk Valley Zimmerman Family in the Eighteenth Century | David Kendall Martin |
| XYZ Families | ZOOK | Three (Zook) Brothers of 1742 | Paul V. Hostetler |