. . .
Even assuming they're the same, rivers are also named from 'wide', as in potamós = river G.
Many place-names in Italy (not necessarily Latin or even Italic) seemed to be named from words for 'wide' like:
Lavernium, Lavinium, Laurentum
***R
Wouldn't Laurentum better be served by linking to a word for "oak"? < something like *dVwr?.