"Esox Lucius"
Esox, the old Latin name for pike, used as early as Pliny; perhaps derived from the Greek isox, or both the Latin and Greek from a common Celtic root (as in the Welsh ehawc, eog, "salmon")
lucius, from the supposed Latin name for the species, likely derived from the Greek lukos, "wolf", an obvious reference to the predatory habits of this fish.
Ironically, the latin for pike is also lucius, so it might be confusing.
Here is how it goes:
1) the first word usually is the name of the genus( means species with common attributes, features, and characteristics to clear up how they get the name)
2) second word is the name of the species is conjugated in the latin adjective form( word used usually refers to or means an attribute of a creature or where it may be from.This can also apply to the genus)