Mathiasen is a Danish-Norwegian patronymic surname meaning "son of Mathias" (equivalent of the Biblical Μαθθαιος, cf. English Matthew). Several spelling variants are used, including Matthiasen and Matthiassen. A similar diversity of forms exist for the parallel given name Mathies/Mathis. Though not a hard and fast rule, generally spellings with a single s are Danish and a double ss are Norwegian. There are several people with the surname Mathiasen:

Matthiasen may refer to:

Mathiassen may refer to:

See also

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