Bastards are children who are born out of wedlock. They are also referred to as "baseborn" or "natural" in the lands of the Seven Kingdoms.

All bastards can be easily identified by their surname, which is the same for all bastards in a region. Each region of the Seven Kingdoms has a different surname for bastards. They are:

The Crownlands	- Waters
The North	- Snow
The Iron Islands	- Pyke
The Riverlands	- Rivers
The Vale	- Stone
The Westerlands	- Hill
The Reach	- Flowers
The Stormlands	- Storm
Dorne	- Sand