As far as I can tell it is actually pronounced like "MO-ah-nah" but sounds much more like "MWA-nah", at least by Hawaiians.
♦ ♦ ♦
The body, which gives you during life a form,
Is but your vase: be not deceived, my soul!
Cheap is the bowl for storing honey in,
But precious for the contents of the bowl.
- Al-Ma'arri