1744, from Latinized form of surname of Robert Harley, Earl of Oxford (1661-1724) and his son Edward, in reference to the library of several thousand books and MSS they collected and sold in 1753 to the British Museum.
hare-brained
hare-lip
harem
hark
harken
Harleian
Harlem
Harlemite
harlequin
Harley
harlot