Greysun is not commonly used as a baby boy name. It is not in the top 1000 names. In 2015, out of the family of boy names directly related to Greysun, Grayson was the most regularly used.
Baby names that sound like Greysun include Greysan, Greysen, Garan (English), Garen (English), Garran, Garren, Garrsen, Garrson, Garrsun, Garsen, Garson (English), Garsun, Garwen, Gersan, Gersham, Gershawn, Gershem, Gershim, Gershom (English), and Gershon (Hebrew).
† approx English pronunciation for Greysun: G as in "grin (G.R.IH.N)" ; R as in "race (R.EY.S)" ; IY as in "eat (IY.T)" ; S as in "see (S.IY)" ; AH as in "mud (M.AH.D)" ; N as in "knee (N.IY)"