Sound. So much of language comes down to sound. What is the easiest sound to make? In German this is one of the reasons for adjective endings being what they are — mostly ending in -en, right?!
It’s that same basic principle that is to blame for you getting Name and Namen mixed up or Herr and Herrn. What’s going on with this n that appears and disappears at whim? These are what we call nouns with n-declination (Nomen der N-Deklination). Let’s take a look.
We’ve moved. You’ll find the full article here: http://marathonsprachen.com/german-nouns-with-n-declination-nomen-der-n-dekination/