Will there be any guidelines about which star names will fit well into the GalCiv universe? Having never played one of the previous games, I don't have any point of reference for what a star name "should" look like.
You raise a very interesting question, one that got me thinking about how stars have been named in our history. So I took a look at Wikipedia to see what was said there.
Historically (but not in games) only a comparatively few of the stars visible to the naked eye have been given names. Sometimes a single star can have multiple names. Sometimes the same name is used for more than one star. None of this is unusual when you consider that we have been naming them for thousands of years and have only recently been cataloging star names.
While I found that interesting enough to me to post here for others, here is my guess on what names will be acceptable for GC3:
Any name you wish that does not reflect badly on some one, some thing, a belief, a culture, a country, or on the namer (this last one I think sufficiently excludes abusive and/or derogatory language).