It's latin. Sorry, no idea how to pronounce it.

I'd guess that in general, English tends to pronounce Latin words as they should be pronounced/ as in Latin, not altered. . Well when I was a lad, my latin teacher told me that C is soft like the first one in circle, not hard like the second one in circle. Hence cicero sounds like sisero. . But she said that "church-latin" generally used the hard "c", so cicero sounded like Kikero, I guess. . Perhaps one of the few things I lerned in Latin class :( So, maybe the answer is both ways, depending on where you are. .

Latin name: Nowadays, we say Si - Coo - see - um. We don't really know if that is how it was pronounced way back when.

Latin word- sɜːˈkju:ziəm