Exact origin uncertain. Resuscitated by James Mcpherson in The Works of Ossian (1765). Napoleon, an admirer of the Ossianic poems, chose it for his godson Oscar Bernadotte, who became a king of Sweden.
Possibly from Middle Irish Oscar, from Middle Irish os + cara.
Alternatively, inherited from Old English Ōscār, Ōsgār, from Old English ōs and gār (see Oswald). Compare German Ansgar, Danish Asker, Asger, Norwegian Asgeir, Icelandic Ásgeir.
Disputed. Said to have been named by actress Bette Davis after her first husband, Harmon Oscar Nelson, or by secretary Margaret Herrick after her cousin Oscar Pierce.
Originally a nickname for the statuette; of disputed origin.