I've just been looking into the naming of this. The Armenian government decided to rename it from Zorats Karer to Karahundj in 2004, probably for political and touristic reasons (political because the original name, Ghoshun Dash, is a Turkic expression meaning Stone Army which was translated to Armenian as Zoratz Karer; and touristic because they liked the idea of associating it with Stonehenge).
"The name “Karahundj” was given by astrophysicist Elma Parsamian who noticed the similarity between the name of a nearby village named Karahundj and a famous monument in England which has also been identified with ancient astronomy." - http://www.armenianheritage.org
So, I'll leave it as it is.
P.S. Incidentally, as part of my "research" I found a great youtube video about pronunciation/phonetics from the English Language Club.
Something is not right. This message is just to keep things from messing up down the road