UPDATE: Barry Popik, who maintains the all-things-New York website The Big Apple, recounts a slightly different story about the origin of "Anthora." In his April 10, 2005, entry, Popik says the name came from a misprint in a newspaper article about a sunken Greek ship:
In the story, the urns were called "anthora," rather than "amphora." "I took the name," says Mr. Buck, the cup's creator, who retired from Sherri in 1992. The original engraving of the cup design, unchanged for more than 30 years, hangs in his home office.