http://en.wikipedia.org/wiki/Niflheim
Niflheim (or Niflheimr) ("Mist Home", the "Abode of Mist" or "Mist World") is one of the Nine Worlds and is a location in Norse mythology which overlaps with the notions of Niflhel and Hel. The name Niflheimr only appears in two extant sources, Gylfaginning
http://en.wikipedia.org/wiki/Gylfaginning
http://en.wikipedia.org/wiki/Gylfi
In Norse mythology, Gylfi, Gylfe, Gylvi, or Gylve was the earliest king in Scandinavia recorded. The traditions on Gylfi deal with how he was tricked by the gods and his relations with the goddess Gefjon.
http://en.wikipedia.org/wiki/1272_Gefion
The Gefion family, a family of asteroids,[34] and asteroid 1272 Gefion (discovered in 1931 by Karl Wilhelm Reinmuth[35]) both derive their names from that of the goddess.
http://en.wikipedia.org/wiki/Gefion_family
Gylfi is furthermore informed that when Loki had engendered Hel, she was cast into Niflheimr by Odin: “ Hel he cast into Niflheim, and gave to her power over nine worlds, to apportion all abodes among those that were sent to her: that is, men dead of sickness or of old age. She has great possessions there; her walls are exceeding high and her gates great.[6]
Gjöll is hard by Hel-gates