The affix gha comes in the sense of a descendant after the word kṣatra,
Thus क्षत्रियः 'a Kshatriya.' This is also a class name. The son of क्षत्र will be क्षात्रिः ॥ The affix घ here should not be confounded with the technical घ which means the affixes तरप् and तमप् (1. 1. 22).,