My last name is a WW1 pejorative
Bosch/Bosche “Dunderhead”
“Boche is an abbreviation of caboche, (compare bochon, an abbreviation of cabochon). This is a recognized French word used familiarly for “head,” especially a big, thick head, (“slow-pate”). It is derived from the Latin word caput and the suffix oceus. Boche seems to have been used first in the underworld of Paris about 1860, with the meaning of a disagreeable, troublesome fellow. In the Franco-Prussian war of 1870 it was not applied to the Germans, but soon afterward it was applied by the Parisian printers to their German assistants because of the reputed slowness of comprehension of these foreign printers. The epithet then used was tête de boche, which had the meaning of tête carrée d’Allemand (German blockhead or imbécile). The next step was to apply boche to Germans in general”