Elthea is a variant form of the English Althea.
Elthea is also a variant form of the name Elethea.
Elthea is not popular as a baby girl name. It is not in the top 1000 names.
† approx English pronunciation for Elthea: EH as in "ebb (EH.B)" ; L as in "lay (L.EY)" ; TH as in "theme (TH.IY.M)" ; IY as in "eat (IY.T)" ; AH as in "mud (M.AH.D)"