Alleyn \a-lle-yn\ as a boy's name is a variant of Alan (Old German), and the meaning of Alleyn is "precious".

The baby name Alleyn sounds like Allyn, Alleyne and Allen. Other similar baby names are Alley, Allain, Alyn, Allon, Allin, Allayne, Allan, Alen, Ailean, Albyn, Alben, Alden, Aldwyn, Alfey, Algey, Allson, Allcen, Alten, Allton, Alwyn, Alvyn, Alven, Ailwyn, Arlen, Arllen, Arlyn and Arlenn.