According to WikiPedia, the cup was originally known "as the
“Royal Yacht Squadron Cup” or the “RYS Cup for One Hundred
Sovereigns”. The Cup subsequently became known as the “One Hundred
Guinea(s) Cup”, by the American syndicate that won it. As time went
by, the Cup was also referred to as the “Queen’s Cup”, the “America
Cup”, and the “America’s Cup”. Today, the trophy is officially
known as the America’s Cup and affectionately called the “Auld Mug”
by the sailing community."