Compare OIr. fáel m. 'wolf' < PCelt. *waylo- < PIE *waylo- 'wolf'. The correspondence "could be accidental, since it is based on only two IE languages." (RM) "Arm. gayl and PCelt. *way-lo- are usually interpreted as 'the howler' and derived from PIE *wai- ... One may conclude that PIE *wḷkʷo- 'wolf' has been replaced by (or contaminated with) *wai-lo- possibly 'howler' in Armenian and Celtic for reasons of tabu" (HKM).
Hrach K. Martirosyan. Etymological Dictionary of the Armenian Inherited Lexicon. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online: http://iedo.brillonline.nl.ludwig.lub.lu.se/dictionaries/content/proto-celtic/index.html
Mesrob G. Kouyoumdjian (1970). A Comprehensive Dictionary Armenian-English. Beirut: Atlas Press
Robert Farren, PIE culture words collection, 2017
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