Since one didn't seem to exist, I created it.
These are based on the MERP race descriptions.
Umli: Half-dwarf
Noldor: Fair elf. This could also have mapped to high elf.
Sindar: Grey elf
Silvan: Wood elf
Peredhil: Half-elf (standard, not a RoCoI variant)
Hobbit: Halfling (standard, not a RoCoI variant)
Beorning: Bear Tribe
Black Numenorean: High Man
Dunedain: Mixed Men
Corsair, Dunlending, Eriadorian, Gondorian: Common Man
Easterling, Haradrim, Variag: Dark Tribe
Lossuth: Arctic Men
Rohirrim, Wood Men: Northmen
I didn't include Woses or any of the twisted races since I don't use those as PC options in my campaign. Everything but Woses should be fairly straightforward.