Trondhjem

Etymology
From earlier, , or , Danicisations of  and  ,  or  during the union between Norway and Denmark where the Danish written language was used. itself started out as a name of the region Trøndelag, but later become synonymous with the city, whence also the current name.

Etymology
From, a Danicisation of.

Usage notes
The name of the city was changed from to  on the 1st of January 1930, and then to  on the 6th of March 1931.

The form is still preferred in the more conservative standard.