Man-u-EH-la
Here's a breakdown of the sounds:
* Man: Pronounced like the English word "man."
* u: Pronounced like the "u" in "flute."
* EH: Pronounced like the "e" in "bed."
* la: Pronounced like the English word "la."
Some people may pronounce the "u" more like the "oo" in "moon," but the "EH" sound is the most common.