Illiterate
My husband's grandfather is Bobby Nox Pilgrim. He was illiterate most of his life, so he signed documents with his name misspelled or completely wrong (with his X). He just trusted that whoever was having him sign something was accurate. His father was also mostly illiterate and allowed census takers to take liberties with family names. Once Bobby married Beaulah, his records become clearer. Beulah was not at all illiterate, so records tended to be correct if she was present when he signed something.