Where does “Kätzchen” come from?

Kätzchen (Luxembourgish) comes from Luxembourgish kaz, from Old High German kazza, from Old High German katta, from Proto-Celtic kattā, from Proto-Germanic *kattǭ, from Latin catta, from Latin cattus — a cat.

Kätzchen (Luxembourgish): Diminutive of Kaz: kitten; little cat; endearing...