I've always pronounced my name like "cereal" leaving the "ea" sound out. My mother says it the same as well as my aunt on my father's side. I am the forth one in the family with the same first and last name but the first had a different middle name. It is interesting to learn where the name comes from.
I THOUGHT this name was pronounced SIE-ril in English. I thought everybody pronounced it this way, but it doesn't seem to be like that. I don't like the pronunciation "SEER-il", sounds pretty odd and I would never think of this pronunciation when seeing the spelling of Cyril, ever.