I have a Zachariah Blackburn born 21 Oct 1814 Muskingum, OH. He married Margaret Jordon 25 May 1837 and died in Shellsburg, Benton Co, IA 12 Oct 1912. They are listed in 1860 - 1880 census of Benton Co, IA. 1860 as Zachria and 1880 as Zack. His brother James Blackburn also lived in nearby Palo, IA and they are sons of Joseph and Rebecca Blackburn. There must be a family connection here.