Thrudr

Þrúðr, often anglicised to Thrud, Thrudr, or Thruthr, was the daughter of Sif and Þórr. She resided in Þrúðheimr, her father's palace.

Attestations
Þrúðr is attested in the following sources:

Poetic Edda
The Poetic Edda poem Alvíssmál, in which a dvergr, Alvíss, claims to be engaged to Þórr's daughter, may be about Þrúðr, but the daughter is not named.

Prose Edda
The Prose Edda book Skáldskaparmál (4) tells that Thor can be referred to by the kenning "father of Þrúðr" (faðir Þrúðar). Eysteinn Valdason uses it in his poem about Thor (2). The Skáldskaparmál (21) adds that her mother is Sif.

In Bragi Boddason's Ragnarsdrápa, the Jǫtunn Hrungnir is called "thief of Þrúðr" (Þrúðar þjófr). But there is no direct reference to this myth in any other source. Skáldskaparmál (17), in which Snorri relates the fight between Thor and Hrungnir, mentions a very different cause, and Þjóðólfr of Hvinir's Haustlöng only describes the fight without giving the reason for it. This poem depicts two mythological scenes painted on a shield, the first being Iðunn's abduction by the giant Þjazi. Margaret Clunies Ross suggested that the two episodes might be complementary, both dealing with the abduction of a goddess by a giant, its failure and the death of the abductor. Another kenning may allude to this myth: in Eilífr Goðrúnarson's Þórsdrápa (18), Thor is called "he who longs fiercely for Þrúðr" (þrámóðnir Þrúðar).

Karlevi Runestone
Þrúðr is mentioned on the 10th-century Karlevi runestone on the island of Öland, Sweden, where a chieftain is referred to as the "tree of Þrúðr".