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)
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
Xavier
X-ray
xanadu
X-ray is already a proper noun.
The proper noun is Jessica, the name of a person. A proper noun always starts with a capital letter.
David's
Nope. Common noun.
xenon
xaiver
proper
The word 'World X' is a proper noun, the name of a company, World X Productions, LLC. A proper noun is the name of a person, place, thing, or a title. A proper noun is always capitalized. However, the word is a common noun when not referring to the above company. For example, 'When world X conflicts with world Y, a science fiction tale is born.' This use of 'world x' is a common noun.
Is the x Ray is a proper noun