What does Karl mean in spanish?

There's no direct translation of "Karl" into Spanish. It's a German name.

However, Spanish speakers often use the name "Carlos" which is the Spanish equivalent of Karl.

Other possible options, depending on the context, might be:

* "Carlo": This is an Italian name that is sometimes used in Spanish.

* "Carles": This is the Catalan equivalent of Karl.

So, depending on the situation, you could use any of these names to refer to someone named Karl in Spanish.