There has been much controversy for over 2 centuries regarding the origin of stamvader Adolph Jonker.
Recently two genealogists Martina Louw (descendant of Adolph Jonker) and Jaco Strauss (administrator of the FTDNA Cape Dutch Y-DNA Stamvader Project
http://familytreedna.com/public/CapeDutch/default.aspx?secti... ) combined modern DNA technology with rigorous documentary research to establish the truth about stamvader Adolph Jonker’s origin. Their findings have been published in a comprehensive article Die Herkoms van Stamvader Adolph Jonker (1718-1779) in Familia [52] 2015-2.
A synopsis of this article is available online at
http://www.stamouers.com/index.php/stamouers/surnames-h-to-j... .