2) Taken from the place name Nidaros, an alternative name for Trondheim. The first element of the place name derives from the Old Norse genitive form (niðar) of the river name Nið of uncertain meaning.  
a) Old Norse niðr = 'down, low' (= river flowing low) 
b) Gothic nidwa = 'rust' (= river with rusty water) 
c) Latin nitere = 'to shine' (= river with shiny water) 
d) Old Norse *niðr? (modern Icelandic niður) = 'murmur, purling' (= river with purling water) 
e) Indoeuropean root *nid- = 'to stream, to flow' 
See also Nida
|Female ♀||Male ♂|
|#: count of main first name only|
|&: count of both main and additional first names|
| Name counts are approximate as statistics normally is not published
for names given to less than 3 or 5 persons per country.
No recent statistics trend found in databases for Nidar.