German forms are of the name are more likely to derive from Mathilda while Scandinavian forms are more likely to derive from Margaret. Often, it is impossible to tell what the root name is.
Cite as: R. Le Get, S.L. Uckelman. "Mette". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2015, no. 3. http://dmnes.org/2015/3/name/Mette.