"The Duke" is named after one of the most beloved and respected figures in pro sports history Wellington Mara who spent 81 years with the Giants and made numberous contributions to the NFL. He was named Willington by his father after the Duke of Wellington. He was given the name "The Duke" as a youngster by Giants players. The NFL game ball was known as "The Duke" from 1941 to 1969.

"The Duke" ball was used through 1969 but was discontinued prior to the 1970 season, the first to be played in the NFL-American Football League merger.

The NFL and AFL continued using a Wilson Football but with a new Design.