After a word in the Genitive -6th-Case in construction an affix is added in the sense of 'his dwelling-place' the whole word expressing the name of a country.,
The sutra literally means \his dwelling place\. A place is sometimes named after the people whose habitation it is. Thus शैवः \the country of the Sibis\, ॠजुनावान्निवासौ देशः = आर्जुनावः ॥ The word ॠजुनावां = ॠज्वीनौर्येषां ॥,