Well, it does says "Roman" and "probably of Etruscan origin". So probably, that means it is not in Latin but a Low language that was in it's way to become any of the Romance Languages we know today. Being this Roman Mythology I guess it would be Low Italian(?) and then, that would explain the fact that it is prn. an-je-RON-a and not An-ge-ron-a, as in Italian the "ga" sound is spelled "gh" as in "Spaghetti" and the ja sound is spelled simple with a "g" as in "Giorgio".