Here are some possibilities:
* It could be a nickname for "Maya," a popular Russian name.
* It could be a shortened version of "Marya," another Russian name.
* It could be a completely different name that is not widely known.
To understand what "mya" means in your specific context, you need more information. Please provide context like:
* Where did you see or hear "mya"?
* What was the situation?
* Was it written or spoken?
* Was it used in a formal or informal context?
With more information, I can better understand what "mya" means in your case.