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.
Baby names that sound like Elthea include Elthia, Elata, Elida (English), Elidi, Elletta, Ellota (English), Elodi, Elodie (English and French), Eltheya, Aleyda, Alieta, Aliute (Lithuanian), Elethea, Eletheah, Eletheya, Eletheyah, Elethia, Elethiah, Elethiya, and Elethiyah.
† 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)"