Hadwinn \ha-dwi-nn, had-winn\ as a boy's name is a variant of Hadwin (Old English), and the meaning of Hadwinn is "friend in war". The baby name Hadwinn sounds like Hedwinn, Haddin, Hedwin, Hadwynne, Hadwyn and Hedwynn. Other similar baby names are Eadwinn and Hardwinn.