"Boatswain." Merriam-Webster.com. Merriam-Webster, n.d. Web. 20 Jan. 2016. (Other dictionaries note the variants bo'sun and bosun.)
The tall ship Hawaiian Chieftain once had a bosun that some people called "JohnnyJ." When he told me that his name was actually John Johnson, I didn't believe him. Eventually, we got married, and I've gotten used to it.
Mr. J., as he is often called, has held a variety of jobs since dropping "Bosun" as his official title, but somehow, he always comes back to bosunry. The local baristas know his coffee cup well, covered as it is in fancy knotwork. Leave him alone with a handle or grip of any kind and it will end up covered in decorative twine. It's a kind of compulsion with him, but there are worse vices to have.
As The Landlocked Sailor's resident Bosun, Mr. J. is the principal designer of the shop's rope items.