Where does “clas” come from?

clas (Middle Welsh) comes from Proto-Brythonic *klas, from Latin classis, from Proto-Italic klāssis, from Proto-Indo-European kelh₁- — to call, cry, summon.

Ancestry of “clas”, step by step

StepLanguageWordMeaning
1Proto-Brythonic*klas—
2Latinclassisany one of the five divisions into which Servius...
3Proto-Italicklāssis—
4Proto-Indo-Europeankelh₁-to call, cry, summon

Words derived from “clas”

Every word from Proto-Indo-European kelh₁- →Every word from Proto-Italic klāssis →Every word from Latin classis →