Where does “Leuciscus” come from?

Leuciscus (Translingual) comes from Ancient Greek λευκίσκος, from Ancient Greek λευκός, from Proto-Hellenic *leukós.

Ancestry of “Leuciscus”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	λευκίσκος	bleak
2	Ancient Greek	λευκός	bright, shining, gleaming; light in color; white;...
3	Proto-Hellenic	*leukós	—

Leuciscus — Etymology, Origin & Word History | Etymology Explorer