The term "confluent" (confluence), "Kemper" in Breton, may be find in the place-names of many breton cities:
Quimperlé, Quemperven, Quemper-Guézennec are a few examples.
Of course other "kemper" exist elsewhere in France :
Conflans-Saint-Honorine, Confolens in Charente took their name from this situation of confluence.