* A misspelling of a similar name: It might be a typo of "Miriam," a name of Hebrew origin meaning "bitter" or "rebellious."
* A variation of a different name: There may be variations of "Miriah" in other languages or cultures.
* A made-up name: Some people choose to create unique names for their children.
If you are trying to understand the meaning of "Miriah" as it appears in a specific context, please provide more information.