because there are alot of misinformation out there.
Here is an example that I found on one of my lines:
The parents of my great-great-grandfather John Wesley Warren are Richard/Rueben Warren and Nancy Sanders.
I do know that John Wesley's mother's name was Nancy but I haven't found out what her maiden name was. I do know that Nancy was the head of the household on the 1850 Benton County, Alabama Census. According to the information I found on Elizabeth Warren Garnett and Margaret Warren Phillips(daugthers of John Wesley) their grandparents were Rueben and Nancy Warren. Still there is no maiden name for Nancy.