Xenophon
Xerox
Xerxes
X-Files
Xia
Xi'An
Xiao Meow (Xiao is Chinese for "small")
X-Ie-Poo
Xilonen (Aztec mythology: the goddess of young maize)
Xilonite
Xina
Xio Ling
Xipe Totec (Aztec mythology: the god of seedtime)
Xit
X-Lax
X-Man
Xmas
Xnlt Kittycat
Xo
Xochi
Xochipilli (Aztec mythology: the god of feasting and young maize)
X-Quisit
X-Rated
X-Ray
XS
Xtra
Xtra Fun
Xury
Xuxa
Xuxa la Gata