Gaelic "fang" Indo-European cognates?

I was wondering about actual or hypothetical cognates
(Germanic or Celtic or other languages) for this word:

Scottish Gaelic "fang"
Irish "faing" (fem.); genitive singular fainge; nominative plural
faingeaca (the c in the latter case is aspirated like "ch" as in
loch)

In Irish and Scottish Gaelic it refers to a raven or buzzard. I was
wondering what Indo-European root (if any) it is related to, and if
there were any possible continental cognates.

For example, in Gaul there was a river called "Vangius" (modern
Vignory) and occasionally in Gaul one sees names like Vangio
(or possibly this is a Germanic name-- for example Vangio, one
of the nephews of Vannius, ruler of the Suevi, in Tacitus: Annales
12.29).

***

There is also the tribal name of the Vangiones of Germania
Superior, although for this name plenty of alternate explanations
are proposed:

Old Norse vangr: "field"
(Is this word related to Old High German angar "grass land"--
like the Angrivarii "men of the field"?)

a similar Celtic etymology is possible:
*wag-na- heath (both vowels are long)
*wagno- slope, field

(This is from the University of Wales Centre for Advanced Welsh
& Celtic Studies Proto-Celtic--English wordlist.)

West Germanic "wagnijo" (nominative masculine?) found on 3
lance heads at Illerup in Jutland and the Vimose bog (about 200
AD); possibly related to Old Norse vagn "wagon"

There is a late Latin word that is possibly a borrowing from
Gaulish or another indigenous language (at least according to J.
Whatmough's "The Dialects of Ancient Gaul"):

vanga "spade, shovel" (mentioned by the Roman author
Palladius Rutilius Taurus 1, 43, 3)

Finally, there is another word in Gaelic that may or may not be
related (I can see it being related to a place name, but I cannot
see its connection to a bird):

Scottish Gaelic fang or fanc, irish fanca "sheep pen, enclosure"
panc (genitive painc) "cow market"

***

Does anyone have any thoughts on the etymologies of fang
"raven" or any of the other words mentioned?

Thanks,

Andy