I believe Mknote opened a thread about this months ago... I'll share with you what I remember from it.
These names, the House names, are in resources.dll and they are the same entries that you see when you enter a Starsystem that belongs to one of the four houses: "Stuttgart System, Rheinland space". So any changes you make will not only show up on the Universe NavMap but also when you enter a starsystem belonging to one of the Four Houses.
Each of these Four Houses has a couple of specific starsystems' ids_names linking to it, to put "Bretonia Space" etc. behind it, when you enter such a system. This behaviour, unfortunately, is hardcoded (meaning, it is not arranged somewhere in an ini-file).
I say "unfortunately", because it means that you cannot just add like 6 new Kusari systems; they will not show "Kusari Space" when you enter one them. (There is, however, room for one more Rheinland Space system).
It also means that if you want to get rid of the Houses' names,, you'd also better make new ids_name entries for the Starsystems connected to them, otherwise the player would see "Stuttgart system, space" when entering the Stuttgart system.
You also cannot move the location of these names on the NavMap (at least not by changing some values in an ini-file; I believe Alcander wrote he found a way to do this by hacking the exe, but he didn't reveil it - yet).
So, depending on what you want to do, you will have to think up a creative workaround...
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EDIT: you can edit resources.dll using
Resource Hacker
Edited by - Moonhead on 9/17/2005 3:13:00 PM