The origin of the word 'sandwich' for an item of food may have originated from a story about John Montagu, the 4th Earl of Sandwich. He didn't really 'invent' the sandwich but he may have made it popular.
It is said that in approx.1762, he asked for meat to be served between slices of bread, to avoid interrupting a gambling game. This story may have been rumour or adverse propoganda, put about by his rivals.
But soon people may have started ordering “the same as Sandwich”, and the name stuck !
Confusing Titles
Hereditary English titles can be confusing. The family of the Earls of Sandwich has no real connection to the town itself, only the title. The 1st Earl, Edward Montagu, originally intended to take the title of the Earl of Portsmouth - this may have been changed as a compliment to the town of Sandwich, because the fleet he was commanding in 1660 was lying off Sandwich, before it sailed to bring back Charles II to England.
*We could be eating a 'Portsmouth'!
It is generally thought here, that the word 'sandwich' as an item of food, has no connection with the town, only with John Montagu, who happened to have the title, a 'sandwich' could just as easily have been called a 'portsmouth' if the 1st Earl, Edward Montagu, had not changed his mind over his title.
The Sandwich Isles
Captain James Cook also named the Sandwich Isles (Hawaii) after the 4th Earl, who was his financial sponsor.