Ambrosius \a-mbro-sius, am(b)-rosius\ as a boy's name is a variant of Ambrose (Greek), and the meaning of Ambrosius is "immortal".

The baby name Ambrosius sounds like Ambrosios, Ambrosio, Ambrosi and Ambroeus. Other similar baby names are Ambrus, Ambrossij, Ambros and Ambroise.