My thing about the whole etymology vs. history argument is that 'Kahina' was a deliberate nickname, as in a name created for, the North African Berber queen 'Dihya'. The Arabic nickname she was given was 'al-Kahina' - meaning 'fortune teller' etc.
So... In Drew (or if we want to keep this literal, in-game, her parents) giving her the name 'Kahina', it seems they are trying to tell us something about her. Maybe this is just an example of the twisty misdirection Drew spoke of. So... Let's assume for a minute that all the coincidences and parrallels between the naming of Prisms planets, the naming of Kahina, Salomé and other characters (Hassan, Seven Veils, Innana, the underworld, Persephone, Cassiopeia, Cephus and so on...) are simply there as an elaborate piece of character writing by Drew. The connections are utterly plain, but let's consider that this was simply Drew's creative process, and it tickled him to call characters and places certain things deliberately to make false connections.
So if we assume all that for a moment - what are we left with?
I would say the words and actions of characters in this story as documented in Reclamation and posts on Galnet.
(Talking of which, I found a great source for GalNet posts in an easy readable/searchable format: http://ed.frank-heinrich.net/index.php?title=Galnet_Archive )
One thing that has been ringing out to me recently is the phrase "shadowy forces are at work". It keeps coming up in the dialogue of various characters. (Most recently Salomé herself at Beagle Point and then again at the Children of Raxxla wing send off last week.)
Sounds somewhat underworldish to me. So who are these shadowy forces?
I wonder if galactic powers have already been infiltrated by alien forces of some description. Has anyone seen that sci-fi b-movie from the 80's "They Live", where special glasses were needed to see the aliens among us?
Ok, tinfoil mode turned off again for a minute. Did you know the word 'Shadow' appears over 100 times in all the GalNet posts?
It refers to Shadow president (Felicia Winters or Hudson), the Shadow Navy or Emperor's Dawn 'Shadow' cells...