- Ancestry.co.uk Surname Board - Z - Free Database for thousands of surnames
- Zouein - genealogy and family photos. Also spelled: Zouain, Zwain, Zwein, Zuain, or Zwayne.
- Zupo / Ashbaugh - to preserve the past, embrace the present, and help the future generations.
- Zalenski - compiling the genealogy of Polish and Italian ancestors. Polish families are Zalenski, Bartold and Bielinski. Italian families are Musetti, Ferrari, Bailoni, Mangifesta and Crispo.
- Zimmerman / Zimmermann - to assist anyone researching the surnames of Zimmerman or Zimmermann in the state of Wisconsin.
- Zwick - Michael and Katherine Burkhard Zwick and their nine children immigranted from Bavaria, Germany to Ohio in 1852