Römisch-Lateinische Sprachrelikte im bayerischen Dialekt, Flurnamen

corrlios, m. (gs. -leasa, pl. ~anna). Round fort. corr » Cathair chorr, round fort. corr » Tulacha ~a, rounded, humpy, hills.

Quelle www.pbenyon.plus.com/Misc/Etymology.html ... Etymology Of British Place-names Source: Bartholomew's Gazetteer of the British Isle date c 1900
Cor (Gaelic), a round hill. Corbeagh, Corrog, Corran.

Quelle www.tara.tcd.ie/bitstream/2262/3921/1/jssisiVolXII263_294.pdf
COR, CORR.-About 850 Townland names commence with the syllable COR, and 400 with CORK. These prefixes are usually from the Irish cor, " a round hill," as Cormeen, cor win, " smooth round hill." This word cor, however, has various meanings.
CASHEL.-The word CASHEL is an anglicised form of the Irish caiseal, " a bulwark," " wall," or " circular stone fort." It gives the name to 54 Townlands, while it forms the initial portion of the names of about 40 others, as in Cashelard, caiseal ard, a Townland in County Roscommon, which signifies " high stone fort." The word caiseal occurs in Scotch Gaelic, as Cashel Dhu, " black stone fort" (Sutherlandshire). Compare Manx cashtal, " a castle " or " fortification," as Cashtal-lough, "lake castle," also Welsh castell, Cornish castel, and Breton kastel