Some proper nouns starting with X are:
Xenia, Ohio
Xerox Corporation
Xanax (registered trademark of Pfizer Inc.)
Xi'an, China
Xiamen, China
Xavier Cugat (bandleader)
Xavier McDaniel (Basketball)
Xbox (div. of Microsoft Corporation)
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The noun 'game' is a common noun, but the title of a game is a proper noun. For example: "Solitaire" is a proper noun
Xenia, Ohio is the only city in the U.S. that starts with the letter X. Xalapa is the capital city of the Mexican state Veracruz.
no tree starts with x
The Xhosa tribe in Africa starts with X.
A jump rope