Where does “Crotalaria” come from?

Crotalaria (Translingual) comes from Ancient Greek κρόταλον, from Ancient Greek κροτέω — to rattle.

Ancestry of “Crotalaria”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	κρόταλον	clapper, rattle, castanet
2	Ancient Greek	κροτέω	to rattle

Crotalaria — Etymology, Origin & Word History | Etymology Explorer