Hallo
Andy!
I could not find any connection between
Dionysius and
Nils in any Scandinavian name book.
The Latin form of
Nikolaos (
Nikolaus) was written Nikolás in Old Norse. The name forms changed like this:
Nikolás -> Niclis -> Nighils ->
Niels (Danish) ->
Nils (Swedish and Norwegian).
Scandinavian forms of
Dionysius are Dinius / Dynius (old forms) and Dines / Dønnes (modern forms).
/
Satu