Pronounced KHA ("a" like in father)-DEE. The "KH" being like an English "h" but much more raspy, coming from deep in the throat. I LOVE this name! I am definitely going to name my first born son this, that he may be a good leader to all his younger siblings. Ah, I am so in love with this name, Hadi, Hadi.
Actually, Hadi is not pronounced with a "KH" sound in the beginning. The Arabic letter ه, the first in this name, is pronounced like a regular h. So the pronunciation is HAA-dee.