Sources

“Cockbridge, Corgarff [kɔkˌbrɪg]. This well-known place is locally spoken of as ‘The Cock’. The bridge crosses Allt a’ Choilich, the Cock Burn. ‘The people who kept the public house at the end of the bridge had for their sign a Red Cock painted and hung up, which made the soldiers coming that way inquire for the Cockbridge, which name it retains to this day.’ C. Dawson, Don (1805).” Alexander, 218

Drochaid a’ Choilich (droycht I CHILeech) – was also referred to locally as Ceann Drochaid – Bridge-end.” J. Grant Place-Names of the Cairngorms National Park

“Applies to a stone bridge of one arch over the stream Allt-a-Coileach and near to Corgarff Castle; deriving its name from a party of soldiers who when making the military road from Edinburgh to Fort George, having a cock put up on a pole for a weather vane Maintained by the County”  OS Namebooks OS1/1/81/122 [Also gives ‘The Cock’ as the name of some houses]

Cock Burn – Allt. A mountain stream. / Coileach. A cock; A rill of water. (Gaelic)