Linguistica, Jan 30th 2006
http://www.phil.muni.cz/linguistica/art/blazek/bla-005.pdf
Harald Bjorvad & Frederik Otto Lindemann:
Våre arveord. Etymologisk ordbok, Oslo 2000
reviewed by Václav Blaz^ek
...
Ad pp. 34-35 and "duck" - a possible Celtic correspondent could be
identified in the name 'Inis Ane' of one of the Scooish Islands from
the end of the 1st vent. AD, called 'Insula Anas' "Duck's Island" by
the Geographer from Ravewnna ca. 700 AD ..
[Hamp: Ravenna 'anas'. Études Celtiques 34, 55]
...
So Proto-Celtic might have had the PIE "duck" word after all. That
would increase the likelihood of the theory that the representation
of the soul by ducks in Celtic imagery was based on a pun (*anat-
"duck", *an- "breathe; soul").
Torsten