Schafkäse (German) comes from German Käse, from Middle High German kæse, from Old High German kāsi, from Proto-West Germanic kāsī, from Proto-Germanic kāsijaz, from Latin cāseus, from Proto-Indo-European kwat- — to ferment, become sour; to boil.
Ancestry of “Schafkäse”, step by step
Schafkäse traces back through two separate lines of ancestry.