 Professor Dr. Ernst Christmann declared that the melaphyre stone west of the village on the north side of the Kaulbach (brook) has the characteristic of weathering into ever rounder shapes, shedding one layer after another, rather like an onion.The villagers’ forebears called these rounded stones "Kaulen" or "Kulen", or later even "Kugelen" (resembling the modern German word for “ball” or “sphere”), thus giving the brook its name, a concept reinforced by many of these "Kaulen" being found on the brookbed.Kaulbach had its first documentary mention in 1281 as "Culebach".