Let's see....my current homebrew PHB has
1) Animalfolk*
2) Dragonfolk
3) Dwarf
4) Elf**
5) Gnome
6) Half-elf
7) Half-orc
8) Hillenfaey
9) Hellchilde***
10) Human
11) Mageborn
12) Returned
13) Titanborn****
Scratched through the three that would take me down to 10. Guess I could work with that.
* Would cover aarakockra, aranea, centaur, haregon, leonin, lizardfolk, loxodon, lupin, minotaur, owlin, tabaxi, tortle, yuan-ti and just about every other animal-headed race
** Would cover High, Gray, Wild, Drow, Eladrin and Half-elf
*** Would cover aasimar, tiefling and shadar-kai
**** Would cover goliath, genasi and triton
Maybe I should turn Half-orc into "Goblinoid" to cover Orc, goblin (Small), hobgoblin (Medium), bugbear (Large) & norker (Wild)
and expand Hillenfaey to not only cover halflings, but gnomes and maybe fairy as well. I think I'm set, and the only thing I can see missing is maybe the gith races, and those might be a form of mageborn...