Meaning of the Sanskrit Word: etau

  etau—these two    SB 3.16.2, SB 3.19.29
  etau—these two doorkeepers    SB 3.16.26
  etau—to these two    SB 9.14.21
  etau—these two, namely Rama and Krsna    Madhya 20.262

Can't find any compound Sanskrit words containing etau.