A variant of Agastya is Agasti (Indian).
Agastya is not often used as a baby boy name. It is not listed within the top 1000.
Baby names that sound like Agastya include Achida (Hebrew), Achyuta (Indian), Acyuta, Adauto, Adjatae, Adjatai, Adjataye, Agasti (Indian), Agatho (English), Agosto, Agusto (Spanish), Ajiet, Akida (Swahili), Akwetee (African), Asedio, Asita (Indian), Augusto (Italian, Portuguese, and Spanish), Awotwi (Akan), Adjatay, and Akihito (Japanese).
† English pronunciation for Agastya: AH as in "mud (M.AH.D)" ; G as in "grin (G.R.IH.N)" ; AE as in "at (AE.T)" ; S as in "see (S.IY)" ; T as in "tee (T.IY)" ; Y as in "you (Y.UW)" ; AA as in "odd (AA.D)"