How do you say willy wonky in french?

There is no direct translation for "Willy Wonka" in French. It's a name, and names are often kept as they are in other languages. However, you could translate the name into a French-sounding name, for example:

* Willy Wouky (using a French sound for "won")

* Willy Wonka (using the original name, as it's recognizable)

Ultimately, the best way to say "Willy Wonka" in French depends on the context and your desired level of formality.