Where does the word tycoon come from?



The word tycoon is derived from the Japanese word taikun (大君?).
It is usually translated into English as "great lord" but has pejorative connotations, suggesting an excessive exercise of power and wealth. 

Tycoon entered the English language in 1857 with the return of Commodore Perry to the United States. Perry, a US sea captain, played an important role in the 'opening up' of Japan to the West.   

The term spread to the business community, where it has been used ever since. Source