NJAL:
Other scientists suggested putting the sire’s name first (as they do for many other hybrid animals). So, in that case, we would call a hybrid grizzly-polar bear one of two names:
Pizzly Bear or a Nanulak (the hybrid offspring of a male polar bear and a female grizzly bear)
Grolar Bear or Aknuk (the hybrid offspring of a male grizzly bear and a female polar bear)