וְנָשִׂ֥יא אֶחָ֛ד נָשִׂ֥יא אֶחָ֖ד מִמַּטֶּ֑ה תִּקְח֖וּ לִנְחֹ֥ל אֶת־הָאָֽרֶץ׃
你們要從每個支派中選一位首領，來替你們分這地為產業。
Rashi
לִנְחֹל את הארץ [YE SHALL TAKE ONE PRINCE OF EVERY TRIBE], TO TAKE POSSESSION OF THE LAND i.e. that he should take possession and apportion it in your place (i.e. as your representatives; cf. Rashi on previous verse).
Haamek Davar
And one leader. The meaning of Scripture is that there is no obligation to make a real leader for every matter; the obligation to make a leader is only to be able to parcel out the land. Scripture mentioned them according to the greatness of the people in their own worth and not according to the importance of the tribes.