Need help identifying 6 chairs + 2 armchairs  

Those are an older style of chair, not sure of the era but probably reproductions of an antique ladderback chair from the 1800s or earlier. I can't think of too many reproduction antiques that are of much note. But whether they're worth investigating further or not, this is probably not the best place. We do talk a lot about Danish furniture here but it's all post-WWII Danish Modern style---pared down, simple, and original. Maybe there's a forum somewhere whose focus is Danish cabinetmakers in general, not just Danish Modern style?

Let me preface this response by noting that I know very little about traditional furniture designs.

I believe that your chairs would be called Chippendale ladderback style. Early Danish Modern designs from the 20's and 30's used earlier traditional styles as starting points, then looked to minimize the ornamentation and distill the essence of the chair into a derivative design.

Based on minimal ornamental carving and the use of exposed nail heads and aged vegetable tanned leather, I could certainly see these chairs being made by a Danish cabinetmaker in the 20's or 30's.

Both Thorald Madsen and A Anderson & Bohm exhibited their versions of Chippendale ladderback style chairs in the 1930's. However, their versions are not the same as yours.

Ole Wanscher also designed a Chippendale-inspired chair in 1946 for Fritz Hansen, whose back is closer to yours, but still different. And the seat and lower framing differs significantly. - http://danishdesignreview.com/blog/2017/11/9/ladderback-chair-by-ole-wan...

Good luck on your search. They could possibly be an early lesser-known chair by a well-known designer, or more probably, a small cabinetmaker whose name has been lost to time. Either way, you should leave them the way they currently are.