Different theories account for Bronck's origin.
The Bronx County Historical Society and other publications followed suit. A number of sources published in the early 20th century identify Bronck as Swedish, an idea espoused by A. J. F. van Laer, archivist at the
New York State Library.
Gotham: A History of New York City to 1898, winner of the 1999
Pulitzer Prize for History, also parenthetically claims Bronck as a Dane. A 1908 publication portrays Bronck as a
Mennonite who fled the Netherlands to Sweden because of religious persecution. In a 1977 pamphlet commemorating the founding of the borough a publication of the Bronx County Bar Association states that it "is widely accepted that Bronck came from Sweden, but claims have also been made by the Frisian Islands on the North Sea coast and by a small town in Germany". In 1981, the Manx-Svenska Publishing Co. released a now out-of-print 19-page pamphlet,
The Founder of the Bronx, authored G. V. C. Young
O.B.E., after he had conducted research in the
Netherlands,
Sweden, and
New York. Young reported that he examined crucial references: Bronck's
betrothal certificate dated June 18, 1638, and Bronck's document of guarantee from April 30, 1639. The theories of Bronck's Swedish origin fundamentally rely on Young's interpretations of three key words found in these
Dutch-language documents and that Jonas Bronck's relative Pieter Bronck was born in 1616 in Jönköping, Sweden. In conjunction with John Davidson of
Tórshavn in the
Faroe Islands and Eva Brylla from the
Ortnamnsarkiv in
Uppsala, Sweden, the archival texts were transcribed from their traditional script. Young states that Bronck's middle name Jonsson means that his father's first name was Jonas (excluding the Faroe reverend Morten Bronck) and further that the words referring to Bronck's birthplace and spelled "Coonstay" and "Smolach" speaks for that it is most likely that "Coonstay" was
Komstad in
Jönköping county and that "Smolach" was a misrecording of
Småland, the province in which Jönköping is located. Young concludes Jonas Bronck was born circa 1600 in Komstad, Småland, a historic province of Sweden. This farm or small village was at this time inhabited by Jon Nilsson and his wife Marit Brunk who could be Jonas Bronck's parents or other relatives.
The New York Times cites
Sävsjö the seat of
Sävsjö Municipality in Jönköping County, Sweden, of which Komstad was part. ==Marriage==