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In 1994, my father purchased a Family Name History. I don't know how legitimate it is but it has a lot of information. Hopefully I can fit it all on here.
The German surname Klinkenberg is of local origin, being of that category of surnames derived from the place where the original bearer once lived or held land, a common means of identification in the days before the establishment of the structured surname system. In this instance, the name simply denotes one who is a "native of Klingenberg", the name of two villages in the province of Thuringia in Central Germany. The toponym or placename itself may be translated, literally, as "ravine mountain". This name may also have been used to refer to one who lived by or near such feature.
Reference to this name in written records in Europe may be found as early as the thirteenth century, when the "Topographisches Worterbuch des Grassherzagtums" makes mention of one Uolrich dictus de Clingenberc, who held the position of "villicus" of Ohningen in Konstanz in 1267. Later, it is documented in the "Civlandisches adlige Geschlechbuch" that one Ferdinand Adolph Klingenberg of Riga was conferred with a coat of arms and the right to bear them in 1882. Bearers of this name are most numerous today in the mountainous regions of Germany, that is, in the south of the country, along the Alpine mountain range. The surname Kilkenberg and its variant Klingenberg also occurs in other German speaking regions of Europe such as Austria and Switzerland, where it was undoubtedly introduced by early German settlers.
I don't know how true this information is so please don't hold me to it! Enjoy. Dev