Njörðr has been the subject of an amount of scholarly discourse and theory, often connecting him with the figure of the much earlier attested Germanic goddess Nerthus, the hero Hadingus, and theorizing on his seemingly once great place in Norse paganism due to the appearance of his name in abundant place names.
Njörðr is described as a future survivor of Ragnarök in stanza 39 of the poem Vafþrúðnismál. In the poem, the god Odin, disguised as "Gagnráðr" faces off with the wise jötunn Vafþrúðnir in a battle of wits. Vafþrúðnismál references Njörðr's status as a hostage during the earlier Æsir-Vanir War, and that he will "come back home among the wise Vanir" after the events of Ragnarök.
In stanza 16 of the poem Grímnismál, Njörðr is described as having a hall in Nóatún made for himself. The stanza describes Njörðr as a "prince of men," that he is "lacking in malice," and that he "rules over the "high-timbered temple." In stanza 43, the creation of the god Freyr's ship Skíðblaðnir is recounted, and Freyr is cited as the son of Njörðr. In the prose introduction to the poem Skírnismál, Freyr is mentioned as the son of Njörðr, and stanza 2 cites the goddess Skaði as the mother of Freyr. Further in the poem, Njörðr is again mentioned as the father of Freyr in stanzas 38, 39, and 41.
Loki responds in the stanza 34, stating that "from here you were sent east as hostage to the gods" (a reference to the Æsir-Vanir War) and that "the daughters of Hymir used you as a pisspot, and pissed in your mouth." In stanza 35, Njörðr responds that:
- "That's harmless, if, beside a husband, a woman has
- a lover or someone else;
- what is surprising is a pervert god coming in here,
- who has borne children."
Loki tells Njörðr to "stop" and "keep some moderation," and that he "won't keep it a secret any longer" that Njörðr's son Freyr was produced with his unnamed sister, "though you'd expect him to be worse than he is." The god Tyr then interjects and the flyting continues in turn.
- "That was my reward, when I, from far away,
- was sent as a hostage to the gods,
- that I fathered that son, whom no one hates
- and is thought the prince of the Æsir.
Njörðr is referenced in stanza 22 of the poem Þrymskviða, where he is referred to as the father of the goddess Freyja. In the poem, the jötunn Þrymr mistakenly thinks that he will be receiving the goddess Freyja as his bride, and while telling his fellow jötunn to spread straw on the benches in preparation for the arrival of Freyja, he refers to her as the daughter of Njörðr of Nóatún.
High further states that Njörðr's wife is Skaði, that she is the daughter of the jötunn Þjazi, and recounts a tale involving the two. High recalls that Skadi wanted to live in the home once owned by her father called Þrymheimr ("Thunder Home"). However, Njörðr wanted to live nearer to the sea. Subsequently, the two made an agreement that they would spend nine nights in Þrymheimr and then next three nights in Nóatún (or nine winters in Þrymheimr and another nine in Nóatún according to the Codex Regius manuscript). However, when Njörðr returned from the mountains to Nóatún, he said:
Skaði then responds:
- "Hateful for me are the mountains,
- I was not long there,
- only nine nights.
- The howling of the wolves
- sounded ugly to me
- after the song of the swans."
High states that afterward Skaði went back up to the mountains to Þrymheimr and recites a stanza where Skaði skis around and hunts animals with a bow and lives in her fathers old house. Chapter 24 then begins, which describes Njörðr as the father of two beautiful and powerful children: Freyr and Freyja. In chapter 37, after Freyr has spotted the beautiful jötunn Gerðr, he becomes overcome with sorrow, and refuses to sleep, drink, or talk. Njörðr then sends for Skírnir to find out who he seems to be so angry at, and, not looking forward to being treated roughly, Skírnir reluctantly goes to Freyr.
- "Sleep I could not
- on the sea beds
- for the screeching of the bird.
- That gull wakes me
- when from the wide sea
- he comes each morning."
In chapter 6, a list of kennings is provided for Njörðr: "God of chariots," "Descendant of Vanir," "a Van," father of Freyr and Freyja, and "the giving god." This is followed by an excerpt from a composition by the 11th century skald Þórðr Sjáreksson, explained as containing a reference to Skaði leaving Njörðr:
Chapter 7 follows and provides various kennings for Freyr, including referring to him as the son of Njörðr. This is followed by an excerpt from a work by the 10th century skald Egill Skallagrímsson that references Njörðr (here anglicized as "Niord"):
- Gundrun became her son's slayer; the wise god-bride [Skadi] could not love the Van; Kialar [Odin] trained horses pretty well; Hamdir is said not to have held back sword-play.
In chapter 20, "daughter of Njörðr" is given as a kenning for Freyja. In chapter 33, Njörðr is cited among the gods attending a banquet held by Ægir. In chapter 37, Freyja is again referred to as Njörðr's daughter in a verse by the 12th century skald Einarr Skúlason. In chapter 75, Njörðr is included in a list of the Æsir. Additionally, Njörðr is used in kennings for "warrior" or "warriors" various times in Skáldskaparmál.
- For Freyr and Niord have endowed Griotbiorn with a power of wealth.
Njörðr appears in or is mentioned in three Kings' sagas collected in Heimskringla; Ynglinga saga, the Saga of Hákon the Good and the Saga of Harald Graycloak. In chapter 4 of Ynglinga saga, Njörðr is introduced in connection with the Æsir-Vanir War. When the two sides became tired of war, they came to a peace agreement and exchanged hostages. For their part, the Vanir send to the Æsir their most "outstanding men"; Njörðr, described as wealthy, and Freyr, described as his son, in exchange for the Æsir's Hœnir. Additionally, the Æsir send Mímir in exchange for the wise Kvasir.
Further into chapter 4, Odin appoints Njörðr and Freyr as preists of sacrificial offerings, and they became gods among the Æsir. Freyja is introduced as a daughter of Njörðr, and as the priestess at the sacrifices. In the saga, Njörðr is described as having once wed his unnamed sister while he was still among the Vanir, and the couple produced their children Freyr and Freyja from this union, though this custom was forbidden among the Æsir.
Chapter 5 relates that Odin gave all of his temple priests dwelling places and good estates, in Njörðr's case being Nóatún. Chapter 8 states that Njörðr married a woman named Skaði, though she would not have intercourse with him. Skaði then marries Odin, and the two had numerous sons.
In chapter 9, Odin dies and Njörðr takes over as ruler of the Swedes, and he continues the sacrifices. The Swedes recognize him as their king, and pay him tribute. Njörðr's rule is marked with peace and many great crops, so much so that the Swedes believed that Njörðr held power over the crops and over the prosperity of mankind. During his rule, most of the Æsir die, their bodies are burned, and sacrifices are made by men to them. Njörðr has himself "marked for" Odin and he dies in his bed. Njörðr's body is burnt by the Swedes, and they weep heavily at his tomb. After Njörðr's reign, his son Freyr replaces him, and he is greatly loved and "blessed by good seasons like his father".
In chapter 14 of Saga of Hákon the Good a description of the pagan Germanic custom of Yule is given. Part of the description includes a series of toasts. The toasts begin with Odin's toasts, described as for victory and power for the king, followed by Njörðr and Freyr's toast, intended for good harvests and peace. Following this, a beaker is drank for the king, and then a toast is given for departed kin. Chapter 28 quotes verse where the kenning "Njörðr-of-roller-horses" is used for "sailor". In the Saga of Harald Graycloak, a stanza is given of a poem entitled Vellekla ("Lack of Gold") by the 10th century Icelandic skald Einarr skálaglamm that mentions Njörðr in a kenning for "warrior".
Parallels have been pointed out between Njörðr and the figure of Hadingus, attested in book I of Saxo Grammaticus' 13th century work Gesta Danorum. Some of these similarities include that, in parallel to Skaði and Njörðr in Skáldskaparmál, Hadingus is chosen by his wife Regnhild after selecting him from other men at a banquet by his lower legs, and, in parallel to Skaði and Njörðr in Gylfaginning, Hadingus complains in verse of his displeasure at his life away from the sea and how he is disturbed by the howls of wolves, while his wife Regnhild complains of life at the shore and states her annoyance at the screeching sea birds. Georges Dumézil theorized that in the tale Hadingus passes through all three functions of his trifunctional hypothesis, before ending as an Odinic hero, paralleling Njörðr's passing from the Æsir to the Vanir in the Æsir-Vanir War.