The next pick-up point for further investigations with regard to the origin of the ZWIR T Z family is the research focusing on the geographic appearance of the surname, mainly with help of phone directories (printed or digital). This research leads to the conclusion that the family name with this diction neither was in the past nor is today wide spread - and further more - it appears only in a few countries on earth, with a significant cumulation in Central Europe and North America. More detailed information about the geographic dispersion of the family name ZWIR T Z can be found under the header The Family‘s Geography . With that the overall appearance of the family name ZWIR T Z is far from being comparable with the appearance of the surnames SMITH, MILLER, or for example JOHNSON. But no reason for excitement: a rare appearance does not instantly increase probablity of success for searching and gaining evidence with regard to the family‘s origin. According to current status of research, the family name ZWIR T Z with exactly this diction is documented for the first time end of the 16th century in a baptismal register of the Protestant Church of Preussisch Friedland in former Prussia. Further details can be found in the description of The Family‘s History .