How do you pronounce Petrus?

Excuse me, I'm a bit confused about the pronunciation of a name. Could you please guide me on how to correctly pronounce "Petrus"? I've heard it pronounced in a few different ways, and I'd like to make sure I'm getting it right. Is it "Pee-trus" or "Pet-rus"? Or perhaps there's another way I'm missing? Your help would be greatly appreciated.