I'm just now reading through this thread for the first time. Very interesting!

It's sort of the reverse of the Anglicisation that occurred in the 19th century when the English began calling Scotland "North Britain" so that the Royal Scots Fusiliers became the Royal North British Fusiliers, and obviously Gaelic names were given an Anglo pedigree, such as saying that Kintail came about because its shape was akin to a tail, etc. (I don't recall anybody saying that Kintyre as akin to a tyre, though!)

Anyhow my own name has one of the oddest paths from Gaelic to English... how on earth could Cook be Gaelic?

A book on Ulster names gives three origins to Ulster Cooks:

1) Cook, from the English occupation
2) MacCooge, from MacDhabhoc or MacUag, a branch of Burke.
3) MacCook, from Kintyre and Arran, Scots Gaelic MacCuagh.

As I understand it, some Arran/Kintyre MacCooks trace their ancestry to MacCuach (literally son of the cup, the family of hereditary cup-bearers, others to MacDhabhoc (son of David).

This reverse Angicisation, that is, giving Gaelic versions of non-Gaelic names, occurs in the index of musicians in Ceol Rince na hEireann by Breandan Breathnach.

And a local joke here is referring to our city Long Beach as Cladach Fada.