Actually, John, the etymology of ‘Church’ goes back to Greek {kuriako_n}, an adjective meaning “of the lord’s”. Originally the term was {kuriako_n do_ma}, or ‘house of the Lord’; eventually the phrase was abbreviated down to “kyriak”.
The cross-spelling as “circe” happened in Old English, after writers got into the habit of dropping out an ‘i’ in the middle. (It started out in Old English as “cirice” from “cyrice”, from old German “kirche”, having already dropped the ‘a’ vowel in the transition to German.)
At some point, either in OE or maybe OG (or both), there may have been a pun involving resemblance to the word “circle” (by metaphor meaning a group of people, as we sometimes still speak of a ‘social circle’ of people); which does go back in Greek past the character Circe to the meaning of, well… circle. Which itself may be derived from an even-more-ancient description of certain female body parts. (Thus “Circe’s” name would be a pun in Greek going back to the reason for why circles were originally called circles.) But that isn’t how the term for “church” started off.
For goodness’ sake, it ought to have been obvious that they wouldn’t have named their meeting places after a notoriously disreputable minor Greek goddess. That would be like saying that RevJohn in Greek was named after the character of Calypso undressing herself! ({kalypso_} means ‘veil’ in Greek; it’s a great name for a sexy female character, rather like {kirke_}, so it’s understandable why Homer uses it in the Odyssey. But really.)
You can still use it as a cute historical accident for a rhetorical slur against “the church” as a seductive whore-enchantress, if you like. Jewish OT authors are even more blunt about describing God’s own best-beloved Israel that way! Just be aware that when you do, you’re starting to slide over into name-calling. That’s fine for some forums, but not here.