A character from The Atrocity Exhibition by J. G. Ballard

A prefix meaning "dry" (from Gk. ξηρός) http://www.kypros.org/cgi-bin/lexicon (enter "xiros" in Greek-English pane)

Xero (comics), a superhero comic book published by DC Comics

Xero (SF fanzine), a science fiction fanzine that won a Hugo award in 1963

Xero (band), an Australian punk rock band from the late 1970s and early 1980s

Xero (software), an online accounting system designed specifically for small and medium businesses

Xero (Linkin Park), an American rock band, who eventually became Linkin Park