Final answer:
Among the options provided, 'ka' is not an Egyptian god or goddess. It refers to a spiritual aspect of an individual in Egyptian belief, contrasted to Seth, Ra, and Isis, who are deities in Egyptian mythology.
Step-by-step explanation:
The one that is not the name of an Egyptian god or goddess among the options provided is ka. Seth was the god of chaos and the desert, Ra was the sun god, and Isis was the goddess of fertility and motherhood.
On the other hand, ka refers to a part of the soul or spiritual essence of a person in ancient Egyptian belief, not a deity.