* Phonetic Shift: The "x" sound in Spanish is often pronounced like a "ks" or "gs." It's rare for words to start with this sound in Spanish.
* Origin: Many words starting with "x" come from Greek or Latin roots, and those languages often used "x" differently than Spanish.
However, there are a few exceptions:
* Xilófono (xylophone): This word is borrowed from Greek.
* Xenón (xenon): This word is also borrowed, this time from Greek.
* Xilitol (xylitol): A sugar substitute, borrowed from Greek.
* Xerox: While not strictly Spanish, this is a common borrowed word.
And a few less common words:
* Xantema: A skin condition.
* Xantoma: Another name for a skin condition.
* Xilema: A type of plant tissue.
* Xilografía: Wood engraving.
Important note: Some names, especially those of foreign origin, may start with "X." However, it's not typical for everyday Spanish words.