I had forgotten about captain Sainfoin of Efrafa. It would be rather interesting if it was the same Sainfoin in the miniseries; he would be, along with Woundwort, the only Efrafan character to appear in all four episodes.
Nettle might be an Efrafan, but she does not appear in the final episode unlike Hyzenthlay or Thethuthinnang. Perhaps it is Nelthilta with a simpler name?