Where does “cassa” come from?

cassa (Occitan) comes from Latin cattia, from Old High German keȥȥil, from Proto-West Germanic *katil, from Proto-Germanic katilaz, from Latin catīllus, from Latin -lus, from Proto-Italic -elos, from Proto-Indo-European -e-lós — Forms agent nouns from verbal roots.

Ancestry of “cassa”, step by step

StepLanguageWordMeaning
1Latincattiapan
2Old High Germankeȥȥilkettle
3Proto-West Germanic*katilkettle
4Proto-Germanickatilazkettle, bucket, vessel
5Latincatīllussmall bowl, dish, or plate
6Latin-lusAlternative form of -ulus; diminutive suffix
7Proto-Italic-elosForms desubstantival and deadjectival diminutive nouns
8Proto-Indo-European-e-lós
9Proto-Indo-European-lósForms agent nouns from verbal roots
Every word from Proto-Indo-European -lósEvery word from Latin -lusEvery word from Latin catīllus