I went to visit a client and her newborn in her home. I said, "Aww, this must be baby Matthias"! I pronounced it "Mah-tee-us". She looked at me as if I were crazy, and said, "It's MATH-EYE-US." Am I really crazy, or are there different ways to pronounce the name?
Edited to add: Would you give your baby a name that you know has multiple pronounciations? (Such as Matthias, apparently!)