Eyde

Eyde is a Norwegian surname. The most prominent bearer is Sam Eyde (1866–1940), an engineer and industrialist who founded Norsk Hydro and was a leading figure in early 20th-century fertilizer production.

The Eyde name is also associated with the Birkeland–Eyde process, a nitrogen fixation method developed by Kristian Birkeland and Sam Eyde in the early 1900s. The process used electric arcs to convert atmospheric nitrogen into nitrates for fertilizer; although technologically significant, it was energy-intensive and largely superseded by the Haber–Bosch process.

Eydehavn is a coastal district in Arendal, Agder, Norway, named after Sam Eyde. It originated as a planned company town around hydroelectric and industrial facilities associated with Eyde's enterprises and Norsk Hydro, and later became part of the municipality of Arendal.