Sogn og Fjordane
Down through Ornes (plus Lemvig) are names we appear to have in common. I would guess that we have Ivar Dal and his immediate descendants in common, plus the related Venjum/Oxefot connection, etc.
I've done a bit of research a few years ago turning up these connections, and I'd be happy to share what I have that may be useful to you.
I listed some other names that tend to show up with the names you mentioned, such as Heiberg, Hess, Morgenstierne, Gamst, as well as Kruckow, Tornekrands et al.