i've been pronouncing Forzare like "FOR-zair"
The audio books say it "fo-ZAH-ray"
For the record, they also pronounce "Shide" like "she"
as it comes from harry's pseudo-latin, think about how you would pronounce it, if it were latin.
Yeah sidhe is also in banshee which everyone is probably more familiar with. I think the proper spelling is bean sidhe.