Which Swedish clan includes Beowulf, Ecgtheow, and Wiglaf?

The Swedish clan that includes Beowulf, Ecgtheow, and Wiglaf is the Wægmundings. In Beowulf, the three are connected through Beowulf’s paternal family: Ecgtheow is Beowulf’s father, while Wiglaf is a kinsman from the same broader clan.

The Wægmundings are generally understood as a probably Swedish lineage, although Beowulf himself is a Geatish hero and later king. Ecgtheow belongs to this family before marrying the daughter of Hreðel, king of the Geats. Wiglaf’s father, Weohstan, is also identified with the Wægmundings, making Wiglaf Beowulf’s distant relative.

This answer is easy to confuse with the Scylfings, the ruling Swedish clan, and the Wulfings, the clan associated with Heaðolaf. The Scyldings, meanwhile, are the ruling dynasty of Denmark. Wiglaf is also called a Scylfing in the poem, apparently as a metonym for “Swede,” but that label does not replace his Wægmunding family identity.