Brendolyn is not widely used as a baby name for girls. It is not in the top 1000 names. Out of the group of girl names directly related to Brendolyn, Brenda was the most frequently used in 2015.
A baby name that sounds like Brendolyn is the English Brandolyn.
† approx English pronunciation for Brendolyn: B as in "be (B.IY)" ; R as in "race (R.EY.S)" ; EH as in "ebb (EH.B)" ; N as in "knee (N.IY)" ; D as in "day (D.EY)" ; AH as in "mud (M.AH.D)" ; L as in "lay (L.EY)" ; IH as in "it (IH.T)"