Agustus \a-gus-tus, ag(u)-stus\ as a boy's name is a variant of August (Latin), and the meaning of Agustus is "great, magnificient".
The baby name Agustus sounds like Augustus and Agustin. Other similar baby names are Gustus, Agapetus, Anstas, Anestis, Anastos, Anastius, Anastas, Aristos, Augusto, Augustin, Auguste, Agustino, Agustine, Agosto, Augustyn, Aguistin and Agoston.