Proto-IE: *kauk-
Meaning: a k. of waterfowl
Old Indian: kóka- `ruddy goose (also: cuckoo; wolf)'
Old Greek: kaukalí[ǟ]s m. 'a k. of bird' Hsch., kaukiálēs = botánē tis, homoía koríōi, kaì órnis Hsch.
Russ. meaning: птица (водоплавающая)
References: WP I 331 f