The door of durin.

[Kuruharan]

Originally Posted by Galin

Durin and Narvi can't be on the real doors, as these names are not only not the real names of these Dwarves, they are translations made by someone who knows Old Norse -- a language that did not exist when the actual doors were made, and still very much in the future by Frodo's day even.

While from a certain perspective your point is accurate, remember too that dwarves used outer names that were used in public and used for door carvings and inner ones. Not using their real dwarvish names was entirely appropriate.