Travel with me back to the early days of D&D... back to the AD&D Monster Manual.
There's no doubt that many of the subraces of demihumankind come from Tolkien. In the AD&D Monster Manual you may find the following...
ELF
- High - your generic elf from Tolkien
- Gray - the great elves of Noldor lineage
- Drow - inspired by Norse Mythology
- Half-Elf - like Elrond
- Aquatic - no idea where these come from
- Wood - the lesser races of elves from Tolkien, who never made it to Valinor. Legolas is one, iirc.
HALFLING
- Tallfellow - the Fallohide hobbits
- Stout - the Harfoot hobbits
- Hairfeet - Stoor hobbits (although I may be getting two confused)
HALF-ORC
- some folk in Bree
GNOME
- somewhat original to D&D and based on mythological sources; but so ill-defined that people rarely played them!
DWARF
- hill - your standard dwarf from Tolkien
- mountain - Moria-dwellers.
HUMAN
- if you get the World of Greyhawk, you'll find subraces.
Cheers!