Meaning of the Sanskrit Word: vaitaranyam

  vaitaraëyäm—in Vaitaraëé, the river of suffering    SB 2.2.7
  vaitaraëyäm—named Vaitaraëé    SB 5.26.22
  vaitaraëyäm—in the river known as Vaitaraëé (which lies in front of the doorway of Yamaräja, the superintendent of death)    SB 7.9.41

Can't find any compound Sanskrit words containing vaitaranyam.