"...Andrew Yockey b.abt 1812, d. abt 1907, m. Permillie Swiger; my ggrandfather Andrew Sylvester Yockey b. abt 1854 in Indiana, d. 11 Dec 1917 in Ovid Township, Branch Co. Michigan, m. Eva Hutchins, Elnora Warden, & Rhoda Hollis; my grandfather Ralph Alonzo Yockey b. 25 Mar 1894 in Indiana, d. abt 1958 in Lansing, Ingham, Michigan, m. Blanche Loretta Starin, and my father Lyle Sylvester Yockey,b. 10 June 1910 d. 19 Dec 1975. I can find nothing any farther back than Andrew."
(http://boards.rootsweb.com/surnames.yockey/209/mb.ashx)