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In german, it is a matter of where you live. Basically, articles are used with namens in the centre and the south (including Switzerland and Austria), but not in the north.

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A nice map of the geographical distribution of this feature can be found here:
http://www.atlas-alltagssprache.de/artikelvorname/ (for given names)
and here
http://www.atlas-alltagssprache.de/artikelnachname/ (for family names)