Where does “paneuropeo” come from?

paneuropeo (Spanish) comes from Spanish Europeo, from Latin eurōpaeus, from Latin Eurōpa, from Ancient Greek Εὐρώπη, from Ancient Greek ὤψ, from Proto-Hellenic ókʷs, from Proto-Indo-European h₃ókʷs, from Proto-Indo-European h₃ekʷ- — to see; eye.

paneuropeo (Spanish): Pan-European