* A misspelling of a similar name: There are several names that could be misspelled as "Allayah," like "Aliyah," "Allegra," or "Aaliyah."
* A name of recent origin: It's possible it's a newly invented name or a name from a specific cultural group or region that isn't widely known.
* A made-up name: It could be a fictional name used in a book, movie, or game.
To get a definitive answer, you would need more context:
* Where did you encounter this name? Knowing the source can help narrow down the possibilities.
* What language is the name from? This could help you find its meaning.
Please provide more information so I can help you figure out what "Allayah" means!