creag

Irish

creag f (genitive singular creige, nominative plural creaga)

Irish mutation
Radical	Lenition	Eclipsis
creag	chreag	gcreag
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

^ Quiggin, E. C. (1906) A Dialect of Donegal, Cambridge University Press, page 42

From Middle Irish crec, a contracted form of Old Irish carrac, from Proto-Celtic *karsekki, from Proto-Indo-European *kars- (“to scrape roughly”), similar to English harsh.^[1] Alternatively, the Old Irish is from Proto-Celtic *karrikā, from Proto-Indo-European *kh₂er- (“hard”) (compare Manx carrick, Welsh carreg).

creag f (dative singular creag or creig, genitive singular creige, plural creagan)

Scottish Gaelic mutation
Radical	Lenition
creag	chreag
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

^ MacBain, Alexander, Mackay, Eneas (1911) “carraig”, in An Etymological Dictionary of the Gaelic Language‎^[1], Stirling, →ISBN

Dravidian Origins and the West: Newly Discovered Ties with the Ancient Culture and Languages, Including Basque, of the Pre-Indo-European Mediterranean World, p. 325
Webster's New World College Dictionary, Fifth Edition
Scigliano, Eric (2007): Michelangelo's Mountain: The Quest For Perfection in the Marble Quarries of Carrara, p. 84