I had vaguely thought they'd be named by Vor tradition - Serg + Laisa's father's first name for the eldest, then Serg's middle name & L's father's middle name... and then realized that no, Gregor is probably not naming his son Serg. Hmm.

He might go with Laisa's father's names, following Miles' pattern and setting a tradition for "children with offworld mothers get their maternal grandfather's names." Adds a bit of exotic variety. A few less Donos and Xavs to trip over. Remind everyone that Barrayar is not so isolated anymore, while still keeping some of its traditions.

Of course, that doesn't fix the problem of not having any canon names to work with.