In one of London's novels, Humphrey Van Weyden is rescued by a mysterious Captain Larsen of the Ghost. By what other name is Larsen known?

Captain Larsen is also known as Wolf Larsen.

Explanation:

In "The Sea-Wolf" by Jack London, the story's protagonist Humphrey van Weyden was captured by the captain of the ship named Ghost. The name of the Captain is Captain Larsen, also known as Wolf Larsen, as how the men of the ship call him.

This story tells how Humphrey was captured and made to work as a cabin boy by Captain Larsen. Through various instances, including a failed mutiny to overthrow Larsen, the men including Humphrey were subjected to various hardships. Another castaway named Maud Brewster was taken onto the ship, with Captain Larsen taking a liking to her. He wanted to marry her but Humphrey stopped him. Eventually, he escaped along with Maud Brewster and lived a life together in the end, with Captain Larsen dying from a possible brain tumor.