There are/were a great many Medlocks in England. Somewhere in this mess I call my office, have some research from a lady in England who married a Medlock there. If anyone is interested I will try to find it. There is also a Medlock River, near Manchester I believe. I still believe all the different spellings etc were from diction and spelling , or perhaps a desire to start a new life with a slightly different name. Emma in NM