Welf was a Leitname in the House of Guelph.
Roland was an 8th-century military commander, serving under Charlemagne, who was killed by the Basques at the Battle of Roncevaux. His name was recorded in Latin as Hruodlandus. His tale was greatly embellished in the 11th-century French epic La Chanson de Roland, in which he is a nephew of Charlemagne killed after being ambushed by the Saracens. The Normans introduced the name to England.
A known bearer of this given name was the Austrian-Hungarian (but of Polish descent) flying ace Godwin von Brumowski (1889-1936).
Alberich is a sorcerer dwarf who guards the treasure of the Nibelungen in the medieval German epic the Nibelungenlied. The dwarf also appears in Ortnit as a helper to the hero.