Where does “Cassianus” come from?

Cassianus (Latin) comes from Latin Cassius, from Latin cassus, from Latin cadō, from Proto-Italic kadō, from Proto-Indo-European ḱad- — to fall.

Ancestry of “Cassianus”, 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

Words derived from “Cassianus

Every word from Proto-Indo-European ḱad-Every word from Proto-Italic kadōEvery word from Latin cadō