Reckon= Regne med, Regne for pronounced rye-na
In my usage of regne it translates to “think about” as well.
Det skal jeg regne med.
I lived in southern Denmark in Aabenraa for six months in 1960. Lots of border changes down there.
More recently they build a bridge linking Sweden and Denmark ~ using Oresund (golden sound I think) island.
Digging through the records on who owned Oresund I found ancestors who had competing boat slips for fishing fleet type boats on that island ~ some authorized by Danish kings and others authorized by Swedish kings ~ same piece of beach in fact, at the same time.
Those people continue to think they are different!