Invented Welsh place names

Hi there!

I'm a freelance writer currently writing a science fiction story set in
Pembrokeshire. However, I don't want to set it in a specific place, but
rather I'd like to invent a village so I'm not limited by real-world
geography, etc. I've called it, provisionally, LLANIDRIS. My question is:
does this make any actual sense in Welsh?

The premise of the story is that the goat-footed god Pan has lived in "the
hollow hills" for generations so I'd like something to reflect that. Does
anyone have any suggestions? What would "grove/wood/meadow of the goat
god", say, be in Welsh?

Sorry if this seems like a daft question - but thanks in advance for any
advice!

Cheers!
john


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