Ooooo. A fundamentally PRE-CHRISTIAN name! After all, "sacrificial cauldrons" were not part of the Northern European Christian tradition, but they WERE a feature of Celtic religion.
The most famous, the Gundestrup Cauldron, found in the Danish locale of the same name, depicts the sacrifical drowning of a victim in a cauldron, possibly to honor a god: Cernunnos and Teutates are the most likely candidates.
Does the word "kjell" have any relation to the German "Quelle" (spring of water) or the English "well"? All hold water, even if this premise doesn't.