Johann Jakob (Jacob) Yockey m. Magdalena Schenk Yockey; they were cousins. Magdalena's mother was a Yockey. Jacob's parents were Johann Caspar Jacky and Elisabetha Margaretha Jacky (cousins) and after Elisabetha died, Caspar married her sister Scharlothe (Charlotte).
(http://boards.rootsweb.com/surnames.yockey/105.2.1.1.1.2/mb.ashx)