In Assassin's Creed Valhalla, the Viking protagonist's first name is Eivor.
Eivor is a Norse warrior who leads a settlement from Norway to England during the ninth century. The player can choose a masculine or feminine presentation, but the character's name remains Eivor. This makes the answer a name rather than a gender-specific version of the protagonist.
Eivor becomes allied with the Hidden Ones and is drawn into their struggle against the Order of the Ancients. The settlement at Ravensthorpe acts as a home base, while raids and alliances expand Eivor's influence across England.
Sigurd is Eivor's adoptive brother and an important story character, which makes him a frequent mistaken answer. Ragnar and Ivar are associated with Viking history and the game's wider world, but they are not the protagonist's first name.