Karl and Peter Stefanovic can't agree on how to pronounce their last name

Is it Stefanovic, or Stef-ahn-oh-vitch?

That's the question on everyone's lips after Sunday's episode of 60 Minutes, in which Karl Stefanovic presented the program, while his brother Peter Stefanovic interviewed Jack Johnson.

While chatting with the 42-year-old musician, Peter pronounced his (very famous) last name with a much more European sound than Australians are used to hearing each morning on TODAY.

So, naturally, it started a conversation.

On Monday morning, Peter, 36, appeared on the Fitzy and Wippa Nova breakfast show, and Michael 'Wippa' Wipfli told Peter he had "never heard" Peter's pronunciation before.