Culture of origin

The Celts do not seem to have been the first to be aware of or build a relationship with the Cailleach. Although the word, ‘Cailleach,’ is a Gaelic one, it derives in part from a Latin loan-word … it would make sense, if the Cailleach were native to the British Isles and truly Celtic, that her name would not owe any part of itself to the Romans. If she were Celtic, but not native to the Isles, would there not have been evidence of her among the mainland Celtic tribes to the south (as seems to be the case with Danu)? As of yet, I have not read about this being the case. So my question is, from which culture does awareness of the Cailleach come? In the Isles, prior to the arrival of the Celts, is a time of sporadic population that goes back a while – an article on Wikipedia about prehistoric Britain says Homo sapiens has been present at various points for ‘tens of thousands’ of years. This leaves us with plenty of options to choose from ….