10 December 2010:
A few notes with regard to the new additions to the Günstling family: I believe Samuel Günstling (1819) and family are laid out and connected correctly. The most tentative relationships are between Samuel and Matias (my great-great-grandfather) , their presumable parents Josef and Franziska, and Josef's presumable mother Juditha. I believe Samuel and Matias are definitely related, but whether or not they are brothers is as yet unknown. Regardless, these folks' collective status as relatives is not in question. It's notable that there are a number of German given names across the whole of the Günstling family, and many of those names are unusual for Czechs given the time periods in which they were chosen. It's also worth mentioning that there are no children named after Josef in either of the Matias or Samuel family lines, and both of their first daughters were named Johanna. Until I investigate first-hand in the Czech National Archives, these connections will remain speculative. In the mean time, I've accounted for all persons listed on the 68 Günstling documents in the Czech National Archives' Police Conscription database.
16 September 2009:
There are a few other Günstlings in the Czech Holocaust Archive who were likely to have been family members, but it's impossible to determine their actual connections at this stage. They are: Günstlingová, Hana (b. 1921 - d c.1942 in Terezín), Günstlingová, Emilie (b. 1897 - d. c.1942 in Sobibór), and Günstlingová, Olga** (from Oloumoc, b. 1884 - d. c.1942 in Baranoviči, Belarus). Yad Vashem have the same 12 Günstlings in their database. ** As of 16 September 2009, Günstlingová, Olga has been connected to Karel Günstling; she was his daughter-in-law. I will add her to the family tree as soon as I have more substantive information. It's probable that she was married to Karel's son Samuel.
As it stands there are no Günstlings for Prague in the Czech phone book, and so far I haven't found any in other cities in Czech Republic.