What proper nouns words start with "x"?

Xerxes, Xavier, Xiantao, Xalapa, and Xcel are all proper starting with "x".

Of course, the ones listed above are not all of the proper nouns starting with "x", but they should help get you started. Proper nouns are names used for individual persons, places, or organizations, so look up some companies or people starting with X to find more!