You could pronounce the name "Sack-ee-el," though I'd round the A more like "ah," and I tend to use the throaty sound of CH (commonly described as the CH in loch, though most Americans will still pronounce it "lock").
The I will be the Latinized I, sounding like the two Es in peel. The E is basically what we call a short E, like the E in fell.
The CH is a hard sound; if you are an American think CK. But I imagine it has a throaty element sort of like the C is attempted but not stopped.