Good one, Frederick William IV!

Back when the German kingdom called Prussia was around, it had a king named Frederick William IV (1795-1861). As ruler, he got all sorts of requests, and one came from the people of a city called Gumbinnen.

Since their local river was named Pissa, the townspeople wanted to change the city's name to something that reflected that.

King William's response: "Petition granted. [For the new name, I] recommend Urinoco."