[Pharmboy]

I was referring to the ones who populated the British Isles a while back; possible origin of the word "pixie."

[MacDorcha]

The best I can offer off the bat on them is the texts of Caesar that mentioned the tall blonde barbarians to the north.

Other than that, I need to do some hunting. Ping me later if I forget to get back to you.

[blam]

Read this thread. Dr Elizabeth Barber, in her book, The Mummies Of Urumchi,connect these folks to the Celts of Hallstadt, Austria.
Professor Victor Mair, in his book, The Tarim Mummies, Believes these people spoke Tocharian (an Indo-European language) and is closest related to an ancient form of Celtic languages.

Genetic Testing Awkward Truth About Xinjiang's Famous Mummies (Caucasian)