"You are right that Webster's Dictionary doubts it is stemming from Greek kuriakon -- at least
the online version suggests that it might stem from Latin circus, circulus, the Greek kuklos
"because the congregations were…"
"Yes, good. Only the Kirke bit needs a source, for is very dubious. Since long sabbatharian groups have claimed that "church" would be a pagan word (even falsely linking it with the Greek goddess Circe!), which always weakens their case.…"