I don't have any hard evidence on this. I have her name as Marie Ambrose Maby, with her father as William Maby. Any documentation I may have had on that line was lost in a fire some years ago. I'm not sure there was any. I seem to recall a speculation that the family line was French, from the region of Alsace-Lorraine. The name Maby probably was Anglicized from Mabet. And if my listing is correct, Marie's middle name Ambrose probably came from a maternal name, de Ambroise. Her presumed father William seems to have been born in England, though. Whether this French connection has any validity is an open question. I would accept any firm documentation.