Meaning

noun a carriage for hire

noun a compact breed of harness horse

originFrom Middle English hakeney, from the placename Hackney (formerly a town; now a borough of London), used for grazing horses before sale, from Old English *Hacan īeġ (“Haca's Island”, literally “Hook's Island”). The Old French haquenée (“ambling mare for ladies”), Latinized in England to hakeneius, is originally from the English.

Etymology from Wiktionary, CC BY-SA 3.0