Prime Head is a prominent snow-covered
headland which forms the Northern extremity of
Antarctic Peninsula. The name Siffrey was given to a
cape in this vicinity by the
French Antarctic Expedition under Capt.
Jules Dumont d'Urville, 1837-40, and was previously approved for the feature here described. D'Urville's "Cap Siffrey" has since been identified by the
UK-APC as a point two miles to the ESE, now called
Siffrey Point. The name Prime Head, given by the UK-APC in 1963, alludes to the position of the headland as the first or northernmost feature of Antarctic Peninsula.