Hieronymus \hi(e)-rony-mus, hier(o)-nymus\ as a boy's name is a variant of Geronimo (Italian, Greek), Hieronymos (Greek) and Jerome (Greek), and the meaning of Hieronymus is "sacred name".

The baby name Hieronymus sounds like Hieronimus and Hieronimos. Other similar baby names are Jeronimus, Hieronimo and Hieronim.