Our list of possible “maiden names” for a female ancestor neglected to include an unmarried mother’s maiden name as a possible source for the maiden name. It’s very possible. And it’s also possible that a man’s last name came from his unmarried mother’s maiden name as well. Thanks to MR for reminding me of this.
A document may indicate a certain name is your female ancestor’s maiden name, but remember that depending upon the family situation and who is providing the information, that name could be: a step-father’s last name an adopted father’s last name a foster father’s last name a previous husband’s last name or her biological father’s last name  
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