1- His most common alternate name is Lopt which is pronounced Loft and is Old Norse for sky. (it's where the english word Loft comes from. Sky is also an Old Norse word it means cloud.)
2- He's never specifically called a fire god in the mythology but he is associated with fire multiple times in the myths. (Made a flaming sword and a flaming barrier around a hall he built with some dwarfs. Also an image of him was found on a bellow stone.)
3- In the Faroese tradition he was considered a very good god and called the gift giver.
4- He's almost certainly Lodur a figure who gave humans flesh and blood. (Also the name Lodur might come from the