Dáinn ("Dead") or Dain is a character in Norse mythology. Mostly the tales relate to him being a dwarf and in others as king of elves. However, in other stories the dwarf god is referred to as Dvalinn.
A King's Sword
His name is found on king Högni's sword Dáinsleif ("Dáinn's legacy"). It is laid with a curse which says it must always kill a man when it is drawn.
In the Hyndluljóð (7) he is said to have made Freyja's boar Hildisvíni, along with another dwarf, his brother Nabbi.
Dáinn is referred to as a dwarf in the dwarf-þula of the Völuspá (11) and in a stanza by Sigvatr Þórðarson. But in the Hávamál (153) he is said to be an elf who carved the runes:
"Odin for Aesir, and Dain for the elves, Dvalin for the dwarfs, Asvid for the giants, I myself carve some". ~~Havamal 143
In Norse Astrology
In the constellations of Norse mythology there is also a constellation named after Dain, one that resembles a deer. It is considered as an elven name. Whereas there is also a constellation named Dvalin, which is considered a dwarf name and constellation.