Here's the breakdown:
* आत्मा (ātmā) means "self" or "soul".
* आत्या (ātyā) is a derivative of आत्मा (ātmā) and refers to a close female relative, especially a father's sister.
It's interesting to note that the word मामा (māma), which is commonly used in Hindi and other Indian languages to refer to a maternal uncle, literally means "mother's brother" in Sanskrit. It's a good example of how words can evolve and become more specific over time.