Etymology unknown. “WH and IEW lump together a larger number of words, the connection of which is unwarranted. The combination of hirc- : hirqu- : Sab. hirp- is used to suggest a preform *herkʷ-, but 'goat' and 'wolf' are no good friends. In general, words for 'goat' lack a PIE etymology. A possible source is the word for 'rough-haired', see hirtus.” (MDV). GK suggests a possible link with PGm. *irha- m. ‘he-goat’, PCelt. *yorko- ‘roebuck’, Gr. δόρξ, ζόρξ, ἴόρξ, etc.
Michiel de Vaan. Etymological Dictionary of Latin and the other Italic Languages. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Guus Kroonen. Etymological Dictionary of Proto-Germanic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Robert Farren, PIE culture words collection, 2017
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