Meaning of the Sanskrit Word: prthoh

  prthoh—of King Prthu    SB 4.16.3, SB 4.16.14, SB 4.19.2, SB 4.19.10, SB 4.19.32, SB 4.22.17, SB 4.23.31
  prthoh—that of Prthu    SB 3.1.22
  prthoh—King Prthu    SB 4.18.32

Can't find any compound Sanskrit words containing prthoh.