See also the related category faithful (holy).
Iselda is not popular as a baby name for girls. It is not in the top 1000 names.
A baby name that sounds like Iselda is the English and German name Isolde.
† approx English pronunciation for Iselda: IH as in "it (IH.T)" ; S as in "see (S.IY)" ; EH as in "ebb (EH.B)" ; L as in "lay (L.EY)" ; D as in "day (D.EY)" ; AH as in "mud (M.AH.D)"