With the planet or capital ship selected, click the orange-ish arrow at the top of the portrait window. You can only have about 12 or 13 characters though. Unless there's a mod I'm not aware of that changes this.
I figured the reason was because most of the people that use linux don't play games on it.
If I have the time and inclination, I try to name my stuff after ships from Ian M. Banks 'Culture' novels. Sadly, most of those names are a lot longer than are allowed. Which is a pity, because just some of the names from "Excession" are awesome, let alone the other books: Fate Amenable To Change Furious Purpose Serious Callers Only Shoot Them Later Sober Counsel Appeal to Reason Anticipation Of A New Lover's Arrival, The Is that last one not the gr
