Mette is also Dutch (evidence for this can be seen on the popularity chart for the Netherlands) and Finnish. The name day for Mette in Finland is March 15.
My first (and only) association is Mette-Marit, wife of the heir apparent of Norway.It is strange because both Mette and Marit are diminutives of Margaret.Anyway.. I would not use it. It is a diminutive and alone it is not so fascinating.
This is a very, very common name in Denmark. A lot of girls in my baby sisters´ school classes are called Mette. A little boring name, but it's nice that it means "pearl".
Also Finnish:
https://www.behindthename.com/name/mette/top/finland
https://www.nordicnames.de/wiki/Mette