First found in Franconia, where the name was an integral part of the feudal society which would shape modern European history. Many prominent branches of the family would strive to make this name renowned as they contributed to the social, economic and political affairs of the region.

The great European flow of migration to North America, which began in the middle of the 17th century and continued into the 20th century, was particularly attractive to those from Bavaria who wished to escape either poverty or religious persecution. For many Bavarian tenant farmers, the chance to own their own land was a major incentive. So the widespread colonization of the United States began in 1650, when many immigrants from Germany settled in pockets in Pennsylvania, Texas, New York, Illinois, and California. In Canada, German settlement centered in Ontario and the prairie provinces. Among those of this surname listed in various historical records were: Paul Kastner, who settled in Germantown, Pennsylvania between 1683 and 1709; Conrad, Georg, and Peter Castner, who all arrived in New York City in 1709.

For more information on the last name Kaestner, the PDF Surname History is available for purchase as well as other products.