Historisch-Biographisches Lexikon der Schweiz (7 volumes + Supplement), Neuenburg 1921-1934.
The Historical-Biographical Encyclopedia of Switzerland compiles historical information as well as biographical notes on large or famous families (including extinct ones, not mentioned in the Register of Surnames), often giving details on important family members. As a standard reference the HBLS will be available at major Swiss libraries; it is also available from LDS (films 1181541-3 or fiche 6000814).
A revised version of the HBLS is the Historical Encyclopedia of Switzerland; after a long planning stage the first few articles have been placed on the internet. See http://www.dhs.ch/interne/hds.htmhttp://www.dhs.ch/interne/hds.htm for some information (in English) or take a look at the actual data (German/French/Italian only), starting from http://www.snl.ch/dhs/externe/index.htmlhttp://www.snl.ch/dhs/externe/index.html
opening the book you get;
Thalmann, Clara - - - d 1908- Thalmann, Ernesto - - - f 1914-1993 Thalmann, Ernst-Alfred - - - - 1881-1938 Thalmann, Hanny - - - - 1912-2000 Thalmann [-Antenen], Helene - - - d 1906-1976 Thalmann, Pavel - - - d 1901-1980 Thalmann, Peter - - - d 1777-1866 Thalmann, Walter - - - - 1967!-1969!
This means that this is a well known swiss family and checking the old book you should find more.