Meaning of the Sanskrit Word: vrsnisu

  vṛṣṇiṣu—in the Vṛṣṇi dynasty    SB 1.3.23
  vṛṣṇiṣu—for the Vṛṣṇis also.    SB 1.8.41
  vṛṣṇiṣu—among the Vṛṣṇi family.    SB 1.9.18

Can't find any compound Sanskrit words containing vrsnisu.