Hallen \ha(l)-len\ as a boy's name is a variant of Hale (Old English), and the meaning of Hallen is "hero, from the hall". The baby name Hallen sounds like Halen, Haylan and Howlen. Other similar baby names are Dallen, Halden, Halley, Hallem, Halle, Halten, Hamlen, Harlen, Mallen, Tallen and Vallen.