Number of
Name 		Guesses Already
-------------------------------
Xanadu           1
Xandy            1
Xanto            1
Xaphod           1 (as in Xaphod Beeblebrox)
Xavier		 100
Xenophon         1
Xeres (king)     1
Xerox		 1
Xerxes           2
Xylophone        1
X-Windows        1
X.25             1
Ten              1
Christ           1
Cross            1
Just an Initial  1
Chi              1
unknown name of 
some forebear 
a la Malcolm X   1
transmit (ie TXB)1
extra            1