Step 1 : Introduction to the question "Which islands used to be called the "Sandwich Islands"?"
...Captain James Cook visited the islands on January 18, 1778 and named them the "Sandwich Islands" in honor of John Montagu, 4th Earl of Sandwich, who was one of his sponsors as the First Lord of the Admiralty. This name was in use until the 1840s, when the local name "Hawaii" gradually began to take precedence.