Meaning of the Sanskrit Word: visnau

  viṣṇau—unto Lord Viṣṇu (not to anyone else)    SB 7.5.23-24
  viṣṇau—unto the Supreme Personality of Godhead, Viṣṇu    Madhya 9.259-260
  viṣṇau—in Lord Viṣṇu, or Kṛṣṇa    Madhya 23.8

Can't find any compound Sanskrit words containing visnau.