A valuable resource that is now available online is the Swiss Family Name List. This link takes you to the Italian home page, since no English version is available.The database lists surnames of all families in possession of Swiss citizenship in a Swiss community as of 1962. The information includes the place of residence at the time, the date when citizenship was attained as well as the place or country of origin. Around 48,500 names listed. Happy researching!
English version is found: http://www.hls-dhs-dss.ch/famn/index.php?lg=e