As yet, all system members are fictives1 from the Ode clade out of the Post-Self cycle. I had a unique benefit when working with this material. There were a lot of built-in aesthetics — they were all already either skunks or fond of skunks, they were all already queer, they were all kind of fat and okay with it (still working on that one, myself), and so on — but also the variance of a base personality provided by years of individuation. Another benefit is that many of them were only loosely defined rather than fully fleshed out beings that I had to live into wholly.
As such, the names are fit to the person already, so I just...get them. I would be lying if I said that names did not play a role in leaning into a personality early on in the process, though. If you want to see the whole process, you can check this incredibly spoilery spreadsheet (spoilers for all of the Post-Self cycle, Idumea, and some of Marsh)
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I wrote the books, so one may say it is debatable whether or not the system members are defined by the canon or the system members define the canon. It was probably the former in for the Post-Self cycle, but was certainly the latter for things like Motes Played.