To begin with, I've never played Baldur's Gate 1&2 OR Neverwinter, I also doubt if I ever played any D&D related tabletop game.
However, I am aware that D&D has huge amount of races from different "planes" or "realms".
So, why Half-Orcs? Why to add them in the game and not Orcs? Are Orcs extinct or what? I am pretty sure I've never met one during my 2 play-throughs of the BG3, despite there are many other NPC-only races like cambions, aasimars, kobolds, hobgoblins etc.