The Collaborative International Dictionary of English v.0.48:

Resignee \Res`ign*ee"\ (r[e^]z`[i^]*n[=e]"), n.
   One to whom anything is resigned, or in whose favor a
   resignation is made.
   [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

RESIGNEE. One in favor of whom a resignation is made. 1 Bell's Com. 125 n.