"British" peoples brings Picts to mind, since I don't
remember hearing of Picts elsewhere than Britain.

The Celts were all over West Europe in the old days leaving
DNA behind, mainly showing up in Ireland, Wales, (Cornwall??),
and Scotland these days, I think. Iberian might refer to the
Spanish traces in Ireland, and maybe a few in Scotland.

The term "West Asian" would seem to me to refer to the "-istans"
and India, and the like. Possibly Persia/Iran.

Seems to me that the categories given in the OP are not very useful;
much too general.

Dave Oesterreich