See also the related form, the Welsh Taffy.
Dafydd is not popular as a baby boy name. It is not in the top 1000 names. Out of the family of boy names directly related to Dafydd, David was the most widely used in 2018.
Baby names that sound like Dafydd include Dabeat, Dabeet, Dabeit, Dabyt, Daevid, Daevyd, Daibhead (Irish), Daibhidh (Irish), Daivat (Indian), Daivid, Daividh (Scottish), Daveed (Russian), David (Armenian, Czech, Dutch, English, French, German, Hebrew, Portuguese, Russian, Scandinavian, Slavic, and Spanish), Davidd, Davidde (Italian), Davide (French and Italian), Davood, Davyd (English), Davydd, and Dawid (Polish and Yiddish).
† English pronunciation for Dafydd: D as in "day (D.EY)" ; AA as in "odd (AA.D)" ; V as in "vow (V.AW)" ; IH as in "it (IH.T)" ; TH as in "theme (TH.IY.M)"