1870, "public path beside a waterway," from French quai (12c., see quay). Often short for Quai d'Orsay, the street on the south bank of the Seine in Paris, since mid-19c. site of the French Ministry of Foreign Affairs and hence sometimes used metonymically for it (1922).
Examples from the Web for quai
For the present, I am staying with my friend on the Quai de Cronstadt.The Destroyer
Burton Egbert Stevenson
“Save yourselves; you are marked,” whispered a voice, as we came to the Quai.
In the midst of it all I walked unchallenged to the Quai Necker.
What has my existence been since that day on the Quai by the Vierwaldstattersee?A Woman's Will
The troops can consequently embark at Quai in about four hours.Operations Upon the Sea