What are proper nouns beginning with letter x?

You're right! There aren't many common proper nouns that begin with the letter "x". Here's why:

* Sound: The "x" sound is generally not a common beginning sound in English.

* Origin: Many proper nouns come from Greek or Latin roots, where "x" isn't often found at the beginning of words.

However, here are a few examples, mostly from names and places:

* X-Men: A popular superhero team.

* Xerxes: A historical Persian King.

* Xenia: A Greek city and a feminine name.

* Xanthus: A river in ancient Anatolia.

* Xochimilco: A borough in Mexico City.

* Xi Jinping: The current President of China.

Let me know if you'd like to explore other interesting proper nouns!