definitely Manx.
Several possible origins
Mac Mharcuis, Mac Fhorcius, Mac Quarrak, Mac Querkus
Has connections with Quark which has been almost entirely superseded by Quirk.
Also Kerruish may be a variation.
Corkish will take you back to the mid 1600s
Manx Genealogy Archive 1 is maintained by isleofman.com
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