Dictionary of Medieval Names
from European Sources

Mette f. A diminutive of either Margaret or Mathilda.

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.

Latvia
Middle Low German
1453 Mette Arbusow p. 97
Cite as: R. Le Get, S.L. Uckelman. "Mette". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 4. http://dmnes.org/2016/4/name/Mette.