Aldwinn \a-ldwi-nn, al(d)-winn\ as a boy's name is a variant of Aldwin (Old English), and the meaning of Aldwinn is "old friend". The baby name Aldwinn sounds like Aldwynn and Aldwinne. Other similar baby names are Eldwin, Alwine, Aldwyn, Aldin, Aldrin, Aldwynne, Alwin, Baldwinn, Gladwinn and Goldwinn.