Evander is a name that could build on the popularity of shorter form Evan, and could work and play well with schoolmates like Zander and Xander.
Evander was prominent in Greek and Roman mythology: in classical lore Evander was a wise Arcadian hero who founded the city in Italy that preceded Rome, appearing in Virgil's Aeneid.
Evander also derives from a Norse name meaning bow warrior.
In modern times, the name has been associated with boxing champ Evander Holyfield.
Evander could make a more distinctive aternative to Alexander.