Meaning of the Sanskrit Word: yayoh

  yayoh—in both of which (rivers)    SB 4.6.25
  yayoh—in both of which rivers    SB 4.6.26
  yayoh—both of whom (Nara and Narayana)    SB 4.1.53
  yayoh—by whom    SB 4.1.13
  yayoh—of which two    SB 3.29.35

Can't find any compound Sanskrit words containing yayoh.