Xingu

Xingu, a river in Brazil, which rises in the heart of the country, and after a course of 1300 m. falls into the Amazon 210 m. W. of Pará.

Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)

Ximenes de Cisneros, Francisco * Xucar
[wait for the fun]
Xavier, St. Francis
Xebec
Xenien
Xenocrates
Xenophanes
Xenophon
Xeres
Xerxes
Xesibeland
Ximenes de Cisneros, Francisco
Xingu
Xucar
Yablonoi Mountains
Yacu-mama
Yahoo
Yajur-Veda
Yaksha
Yakutsk
Yale University
Yama
Yambo