What was convention for naming World War 2 Normandy beaches?

The code name for the Battle of Normandy in June of 1944 was Operation Overlord. The codes given to the different beaches were Utah, Omaha, Juno, Gold, and SWord. The Americans landed at the Utah and Omaha Beaches, while the British were assigned to the SWord and Gold Beaches. Canadian forces landed at Juno Beach.