Alberich is a dwarf in Nibelungenlied

Alberich is the name of an experimental synthetic rubber skin for German WWII U-boats, designed to counter Allied sonar devices.

Alberich is sorcerer and/or King of Elves, according to Eddic and Germanic mythology, 5th to 8th century AD

Alberich is a dwarf or Andvari in Der Ring des Nibelungen by Richard Wagner

Alberich is a character in the Heralds of Valdemar series by Mercedes Lackey.