Ifing. A river which divides the giants from the gods. Ifing.
Imd. One of Heimdal's nine giant mothers. Imd.
Imr. A son of the giant Vafthrudner. Im.
Ingunar-Freyr. One of the names of Frey. Ingun's Frey.
Ivaldi. A dwarf. His sons construct the ship Skidbladner. Ivald.
J
Jafnhar [Equally high]. A name of Odin.
Jalkr. A name of Odin (Jack the Giant-killer?). Jalk.
Jarnsaxa [Iron-chopper]. One of Heimdal's nine giant mothers. Jarnsaxa.
Jarnvidr [Iron-wood]. A wood east of Midgard, peopled by giantesses called Jarnvids. This wood had iron leaves. Jarnvid.