Where does “Silurus” come from?

Silurus (Latin) comes from Ancient Greek σίλουρος, from Ancient Greek οὐρά, from Proto-Indo-European ors- — tail.

Ancestry of “Silurus”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	σίλουρος	wels catfish
2	Ancient Greek	οὐρά	the tail, of a lion, dog etc; the rear-guard,...
3	Proto-Indo-European	ors-	tail

Silurus — Etymology, Origin & Word History | Etymology Explorer