What is "annar"

In Norse mythology, according to the Gylfaginning, Annar ( Old Norse Annarr 'second, another') is the father of Jörð ( Mother Earth) by Nótt (the Night). The form Ónar (Old Norse Ónarr 'gaping') is found as a variant.

Annar/Ónar is also the name of a dwarf in the catalogue of dwarfs in the Völuspá that is repeated in the Gylfaginning.