Wiktionary
birth name
n. A name chosen for a child at birth.
Usage examples of "birth name".
He would leave messages referring to me with a series of names that ranged from my birth name, Brian, to Bubba, which he used on everyone.
Only close relatives remembered his birth name and called him by it.
His birth name was Pesheval Lal, and the novices and journeymen called him 'Master Lal', but everywhere else he was famous simply as 'Bardo'.
My mother told me, with great surprise, that in fact her birth name was Suchinta, but since it rhymed with the word for “.
Taylor adopted her, their names were entered as parents of record, and Jodi's birth name, whatever that might have been, was changed to Judith Marie Taylor.
In this past month, he had taken to calling her by her birth name.