"Leaving aside the Germanic peoples, we shall find the old word in Europe only in a Baltic language that died out in the seventeenth century and in the Welsh ceinach. Ceinach, an interesting survival, is not however the ordinary Welsh word for 'hare'. This is ysgafarnog (colloquially pronounced 'sgwarnog) '(long)-eared', a derivative of ysgafarn 'ear'. The expression must go back to the old British or Brythonic language, for it occurs in Cornish and as a dialect word has survived the language; it occurred also in the older stages of Breton" (Boyle 1973: 322)
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
Boyle, J. A. (1973). The hare in myth and reality: a review article. Folklore, 84(4), 313-326.
Robert Farren, PIE culture words collection, 2017
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