In some areas of Bohemia it was quite common for people to use farm or house names. If a farmer or a craftsman had only a daughter, her husband would move to the farm or the shop his in-laws owned and the family was then still called by the name of the farm or the house the shop was in: Jan Dworzak married Maria Picha and was henceforth called Jan Picha (but sometimes still Dworzak or Dworzak vel (or) Picha or Picha vel Dworzak). Mostly in the 19th century, after having sometimes several generations called Picha, some priest discovered that the family name was originally Dworzak and so records now stated the name as Picha recte (correctly) Dworzak. At that time the Austrian Empire had designated the church as the official record keeper, so what the priest documented was at that time the legal name of the person. I think, based on observations from the church records I have come across, that this was a somewhat haphazard process depending a lot on the recording priest. It seems that many quietly changed the name to whatever suited them or the family and kept it a single name but some were quite legalistic and the double (and sometimes triple) names stuck - to the point where people had to have their name legally changed in order to drop the "recte" part.