The rivers, in the West of Britain, have names after goddesses; the one that runs through my hometown, and sorta officially splits Wales from England, is known in Latin as Sabrina, but in Welsh as Habren. Both Merlin and Arthur might toss a coin into the river to give thanks for a safe passage, but who do they specifically thank? Sabrina is Habren, but she also isn't.
Sulis is a very interesting example, because she's all three at once; Sulis Minerva, Sulis, Minerva. The patchwork of religion was crazy! The 'identity' of Britain was such a mess, and there was No English, No Scottish, No Welsh. Hell, even the Irish weren't exactly the same! Those identities just didn't exist. It's crazy to think about, a nation so torn between these identities (the Troubles were a particularly violent recent clash) just,,, not having those particular divisions and instead having completely different ones. I hoped to reflect that in my original post :3
Some artefacts and museum displays from the Corinium museum, an amazing little museum for this specific flavour of study, that y'all may find interesting under the cut: