Ok...
There are different layers of star names:
1) Procedurally generated stars within procedurally generated sectors. (e.g. SYREADIAE JX-F C0)
2) Procedurally generated stars within hand-placed sectors. (e.g. STOCK 2 SECTOR AA-A D0)
3) Hand-placed stars. (e.g. HIP 279)
Stock 2 Sector and Col 70 Sector are both hand-placed sectors, which are roughly spherical. When hand-placed sectors overlap, the smaller one takes precedence over the larger one, so the actual shape may be more like a sphere with holes in it.
The system names within a normal cubic proc-gen sector are generated using a formula which starts at the "bottom-west-south" corner. However, because the hand-placed sectors have a spherical or uneven shape, it is not possible to say exactly which names will be present within the sector without checking its precise shape first.
Also, it isn't possible to determine how many systems will be within each particular subsector of any given sector - for instance, the subsector STUEMEAE AA-A B could contain very many star systems, starting at STUEMEAE AA-A B0 and running up to STUEMEAE AA-A Bn where n is something you'd have to find out by checking on the galmap search.
Systems in Col 70 would mostly be unexplored and unknown to edsm - it has been locked for a long time - and it is an enormous sector; offhand I think there would be literally millions of potential system names inside.