Gustus \g(u)-stus, gus-tus\ as a boy's name is a variant of Gustave (Scandinavian), and the meaning of Gustus is "royal staff; staff of the gods".

The baby name Gustus sounds like Costas, Kostis and Kostas. Other similar baby names are Justus, Agustus, Rastus, Eustis, Faustus, Festus, Gustav, Gustaw, Gustavus, Gustaf and Justis.