Other half-blood races

Lately, I have been wondering: Why are there half-elves and even half-orcs, but in all my years I have never read of half-dwarves, half-gnomes etc.? There definitely are mixed-race settlements, for example the city of Mirabar (populated half and half by humans and dwarves), so why do these races rarely or never mix?

Context: My (first-ever) LARP OC is supposed to be a half-dwarf from Icewind Dale, his father being a dwarf from the Battlehammer clan and his mother a barbarian from one of the tribes. But now I wonder if half-dwarves are even a thing.