See also the related category yiddish.
Alein is uncommon as a baby name for boys. It is not in the top 1000 names.
Baby names that sound like Alein include Aalam, Alain (English and French), Alam (Arabic), Alann (English and Scottish), Aleaume (French), Alim (Arabic), Allan (English, German, and Scottish), Alleyn (English and Scottish), Alleyne, Allyn (English and Scottish), Alman, Almen, Almin, Almon (English), Aloin (French), Alon (Hebrew), Altman, Alun (English and Welsh), Alwen, and Alwin (English, German, Portuguese, and Dutch).
† English pronunciation for Alein: AA as in "odd (AA.D)" ; L as in "lay (L.EY)" ; AY as in "side (S.AY.D)" ; N as in "knee (N.IY)"