See also the related category greek.
Gaelyn is not widely used as a baby name for boys. It is listed outside of the top 1000 names.
Baby names that sound like Gaelyn include Gaylin, Gaylinn, Gaelan (English), Gaelen, Gaelin, Gailin, Galan (English), Galen (English), Galin, Galon (Hebrew), Galyn, Gaylen (English), Gaylon (English), Ghislaen, Ghislaene, Ghislane, Ghislayn, Ghislayne, Gilen (Basque), and Gilin.
† approx English pronunciation for Gaelyn: G as in "grin (G.R.IH.N)" ; EY as in "ate (EY.T)" ; L as in "lay (L.EY)" ; IH as in "it (IH.T)" ; N as in "knee (N.IY)"