See also the related category hebrew.
Addyn is not commonly used as a baby girl name. It is not in the top 1000 names.
Baby names that sound like Addyn include Addyne, Adain, Adaine, Adan, Adene (English and Hebrew), Adin (English and Hebrew), Adna, Adwen (English and Welsh), Aideen (Irish), Aitann, Autumn (English), Éadaoin (Irish), Oddnee, Oddney, Oddni, Oddnie, Oddny, Odeane, Odeen, and Odeene.
† approx English pronunciation for Addyn: AE as in "at (AE.T)" ; D as in "day (D.EY)" ; AY as in "side (S.AY.D)" ; N as in "knee (N.IY)"