Accusative, Dative, ?

Question:
  I was just writing a letter to someone in which I listed the suffixes which
  mark Arove"n parts of speech:

    verb: a tense indicator, e.g. -o, -ya, -a, -wi"
    adjective: -e or -i
    adverb: -in or -im  (or -arin, -arim)
    noun:
      subject: no suffix
      first object (Accusative): -en
      second object (Dative): -er
  *   third object ("Jurative"): -em

I was wondering whether there is a standard name for such a "third object"
beyond Accusative and Dative.  I occasionally call it the "Jurative" (origins
obscure and best left that way! :) but this is pretty arbitrary.
Thanks,

Josh