DOTLAN EveMaps

The name Njörðr corresponds to that of the older Germanic fertility goddess Nerthus, and both derive from the Proto-Germanic *Nerþuz.
The original meaning of the name is contested, but it may be related to the Irish word nert which means "force" and "power".
It has been suggested that the change of sex from the female Nerthus to the male Njörðr is due to the fact that feminine nouns with u-stems disappeared early in Germanic language while the masculine nouns with u-stems prevailed.
However, other scholars hold the change to be based not on grammatical gender but on the evolution of religious beliefs; that *Nerþuz and Njörðr appear as different genders because they are to be considered separate beings.
The name Njörðr may be related to the name of the Norse goddess Njörun.

Njörðr's name appears in various place names in Scandinavia, such as
Nærdhæwi (now Nalavi),
Njærdhavi (now Mjärdevi),
Nærdhælunda (now Närlunda),
Nierdhatunum (now Närtuna) in Sweden,
Njarðvík in southwest Iceland,
Njarðarlög and Njarðey (now Nærøy) in Norway.

Njörðr's name appears in a word for sponge; Njarðarvöttr (Old Norse "Njörðr's glove").

Additionally, in Old Icelandic translations of Classical mythology the Roman god Saturn's name is glossed as "Njörðr."

Njörðr is sometimes modernly anglicized as Njord, Njoerd, or Njorth.