[Facts] Re: Pre Christian Latin names and modern Romance languages
Well, if you look up Augustus on this website you can look at the "Related Names" section to see some forms used in modern Romance languages (Auguste in French, Augusto in Italian, etc.)
This website doesn't have the ability to construct modern forms, but Vitruvius is Vitruvio in Italian/Spanish, Vitrúvio in Portuguese, Vitruve in French, Vitruviu in Romanian, and Vitruvi in Catalan/Occitan.