Harry Potter

Turkish has a spelling error. Adım is supposed to have a dotless i, forcing his last name to be pronounced like "ruddle." He should have stayed in regular school a bit longer if he's going to be bending the rules of grammar like that.

That said, Swedish is the clear winner here for making magic Hitler's middle name Gus, and because it makes a lot of in-world sense to use with a Latin translation when every spell also uses Latin. An extra bit of world building, since they logically should have been learning it.