The definition of a maiden name is the surname or birth name a woman has before she marries and takes her husband's last name.
An example of maiden name is Jones for a woman who was named Sarah Jones before she married and became Sarah Stein.
the surname that a married woman had before marrying: now used chiefly with regard to a woman who has adopted her husband's surname
The surname that a girl is given at birth and that some women change when they marry. Also called birth name.