"Maiden name" refers to a woman's last name before she got married. It is the surname she had when she was born or before she changed it after getting married. Full definition
How interesting that you have friends hyphenating their middle and maiden names as opposed to their maiden and married names — I am learning so much today! (mackenziehoran.com)
You can even use maiden names and middle names as inspiration. (pregnancy-info.net)
Preferred Credit Union wants to remind all credit union members to please do not supply any personal information such as: account number, member number, social security number or mother's maiden name when sending an email to us. (preferredcu.org)