I have spelled Eiddileg's name correctly on the first try exactly one time and it was while writing this comment, thank you, welsh language, for keeping me humble.
It's bad enough that women and men have interchangeable names in this language group, but the name pronounced "Beeve" is spelt "Niamh", and "Owen" is spelt "Eoghan".
I feel your pain.
Ah but it's part of their charm.
Can you explain the letters/runes??
There's no significance (I mean, I guess they mean something if you're a Viking but I just picked them at random). I just thought there's a likelihood the Fair Folk leave little communicative trail signs for one another, like dogs peeing on trees...sorry, that's a terrible analogy but it's the first one that sprang to mind. There's that scene in TBC where Doli says "there are fair folk here" and when asked how he knows is like "Because I KNOW, you idiots" and I wondered how exactly that might manifest.
Oh OK... I remember the scene, I believe he said "how do I KNOW? How do you know how to swallow your dinner?" - which to me means it was pretty much instinct, but I like the idea of the Fair Folk having their own runes or alphabet. Maybe it means "Eiddileg is on the warpath today" or "Children of the Evening singing tonight in the Forest of Mawr"....:-)
Oh I gel with both: I do think they’ve got a sixth sense about it for certain; I just also like the idea that there’s like a code, probably only visible to them, marking landmarks and such.
And yes, I like your idea too - leaving announcements like a fairy message board lol.
For sure there is a code, I remember Doli muttering to himself and measuring things out and counting something on his fingers etc...