Probably of foreign origin; Cnidus, a place in Asia Minor -- Cnidus.
Thayer's Greek Lexicon
Strong's 2834: Κνίδος
Κνίδος, Κνιδου, ἡ, Cnidus or Gnidus, a peninsula (now Cape Crio) and a city of the same name, on the coast of Caria: Acts 27:7 (1 Macc. 15:23). (B. D., under the word ; Lewin, St. Paul, 2:190.)
Acts 27:7 - N-AFS GRK:κατὰ τὴν Κνίδον μὴ προσεῶντος NAS: off Cnidus, since the wind KJV: over against Cnidus, the wind INT: over against Cnidus not permitting