Iskra (or Spark), whose real name was Aenyeweddien or Child of fire in Elder Speech, was an elf and one of the members of the Rats. She had dark, luxurious hair and huge, bright almond-shaped eyes. She liked to adorn herself with jewelry. She was Giselher's lover. She was killed, along with the entire gang, with the exception of Ciri, at the hands of Leo Bonhart in Jealousy.
In Polish, "iskra" means "spark" or "twinkle", so her nickname is merely a simplification of her true name.