Where does “Cassius” come from?

Cassius is an English name derived from the Latin name Cassius, of unknown ultimate origin.

Ancestry of “Cassius”, step by step

StepLanguageWordMeaning
1LatinCassiusa Roman nomen gentile, gens or "family name" held by many Roman politicians, historians and other notable individuals. See Cassia gens
2Latincassushollow, empty, devoid of something; lacking;...
3Latincadōto fall, to fall out
4Proto-Italickadōfall, sink
5Proto-Indo-Europeanḱad-to fall
Every word from Proto-Indo-European ḱad-