It's possible that:
* It's a variation of a known name: It might be a misspelling or a unique variation of a name like "Mia" or "Asia."
* It's a fictional name: It could be a name created for a character in a book, movie, or game.
* It has a personal meaning: The person who created the name might have chosen it for a specific reason, like a family tradition or a special meaning to them.
Without more context, it's difficult to determine the exact meaning of "Miasia."