 The fourth theory, based on folk etymology in verse 2.11 of the "Ramayana" states that Agastya is from "aga" (unmoving or mountain) and "gam" (move), and together these roots connote "one who is mover-of-mountains", or "mover-of-the-unmoving".The word is also written as Agasti and Agathiyar.Agastya is the named author of several hymns of the "Rigveda" (3000-2000 BCE).