Fryderyk Chopin

Fryderyk Franciszek Chopin was a Polish virtuoso pianist and composer of French descent from his father's side. 
Chopin's name is often written in French rather than Polish because he moved to Paris at 21 and eventually obtained French citizenship and a French passport, and began using the French version of his name.
Consequently, there are two ways to pronounce Chopin's name, the French version and the Polish version. 
The original and correct way to pronounce Chopin's name in Polish is Free-deh-reek Sho-pen.
Instead, the more common French pronunciation of his name is Frédéric Chopin.