Answer: Mocha Dick was the name of an actual sperm whale that was purportedly the model for Melville
Moby-Dick, or, The Whale was published in the United States on November 14, 1851. (It had appeared earlier in London.)
Melville’s home Arrowhead is located in the Berkshire region of Massachusetts.
Read more about whales and whaling in Eric Jay Dolin’s Leviathan: The History of Whaling in America.
And read more about Melville and his work in Don’t Know Much About Literature: What You Need to Know But Never Learned About Great Books and Authors.