During copyediting, journal disagrees about spelling of paper's main topic Let's suppose my paper is about icebergs.  The paper is accepted to a quite well known journal on a broader topic.  The copy editor has changed the word "iceberg" to "ice-berg" everywhere in the paper.  I have requested twice that the hyphen be removed, and the copyeditor has disagreed.

A clear majority of scientists in my field use the spelling "iceberg" but there is a minority which uses "ice-berg" in their published papers.  It is easy to produce several lines of evidence that this is true.

How should I respond to this situation?  My primary concern is that I want my paper to be easy to find.  I do not think people are searching for papers using the term "ice-berg."

Update:  As suggested by the answers below, I tried to contact the editor.  After waiting a while and getting no response, I tried again.  And I waited, and tried a third time.  Subsequently and without explanation, the copy editor made the requested changes.  Overall, I had to check five proofs.  In summary, I was successful but I am not sure why.
Putting style above content and reducing the ability to find the paper does not help anybody. My experience with copy editors is that they make and introduce far more errors and problems than they solve.

Anyway, I would discuss this with the editor that accepted your paper and give him/her the scientific reasons. This might help more than discussing the issue with the copy editor.