So I have come across an interesting word in English: "Shark." All the (highly reputable) etymological resources I have available to me say that the origin is unknown. Perhaps this isn’t such a mystery as they would claim. As sharks are not common in the North Sea or waters around the UK, the first recorded use of the word “shark” in English was that of adventurer John Hawkins displaying the carcass of one in London in 1565 after his journey to South America. Interestingly, the secondary meaning of the word, to indicate a swindler, appears in print as early as 1599.