Linda. I am a McMullen descendant. I have found all these spellings in the same lines of people in my family. Now with that out of the way, I am the Ggrandaughter of Barbara Ellen McMullen, dau of Ezra McMullen, son of Richard McMullen. The only John I show in our line is a John C. McMullen b abt 1815, but I show a John Jr. 1850 Census, Belmont Co. OH. I also have a John McMillen, Civil War, Co. C 14th WV Infantry, who is buried in Pine Grove Cem. Pleasants Co. WV. Hope this helps, Martha Sargent