
1) Danish surname 2) Patronymic surname
Found on
https://www.crosswordclues.com/clue/matthiessen

Matthiessen is a Danish-Norwegian patronymic surname meaning `son of Mathies` (equivalent of the Biblical Μαθθαιος, cf. English Matthew). Several spelling variants are used, including Matthiesen, Mathiesen, Matthisen and Mathissen. A similar diversity of forms exist for the parallel given name Mathias. There are several people with the s.....
Found on
http://en.wikipedia.org/wiki/Matthiessen
No exact match found.