The name Xander is a boy's name of Greek origin meaning "defending men". Xander is ranked #201 on our popularity charts and is often added to lists like Boy Baby Names Moving Up Fast and discussed in our forums with posts like "Name sightings".
From the experts:
One of the newer short forms of Alexander, Xander is a spelling that first saw the spotlight via Buffy the Vampire Slayer, and then as Vin Diesel's character in XXX. This relative newcomer, along with phonetic spelling Zander, is now just outside the Top 200 names in the USA. Mad Men star January Jones named her son Xander Dane.
Even shorter forms Xan and Zan are now also being used on their own. Xan is a character in the P. D. James novel The Children of Men, and is a favorite choice of computer game creators.