The affix khac comes after the verbs - 1. bhṛ 'to bear' 2. tṝ 'to cross over' 3. vṛ 'to choose' 4. ji 'to conquer' 5. dhāri 'to hold' 6. sahi 'to bear' 7. tapi 'to heat' 8. dama 'to subdue',
Both the words कर्मणि and सुपि of sutra 1 and 4 are understood here and should be applied as the occasion requires. Thus विश्वम्भरा 'earth' (that which supports all); रथन्तर 'the Rathantara Sama'; पतिंवरा 'a girl' lit. (who is about to choose a husband); शत्रुञ्जयः 'an elephant' lit. (who conquers the enemy); युगन्धरः 'a mountain' or 'the pole of a carriage to which the yoke is fixed'; शत्रुंसहः 'Satrunsaha' (withstanding an enemy); शत्रुन्तपः 'Satruntapa' (destroying an enemy); अरिन्दमः 'Arindama' (victorious).
Why do we say 'when denoting a name' ? Observe कुटुम्बभारः 'he who supports his family'.,