I'm here because while recently sorting through some of my deceased grandfather's belongings I came across a partial genogram pertaining to my deceased mother whom was adopted.

She is noted as "given middle (adopted/maiden) married [AdditionalName]" now throughout her life she knew she was adopted, but was told little to no information about her biological lineage.

Is it possible this addition name noted in brackets is potentially her Birth name? What else might the bracketed name mean?