Compound (linguistics)
Agglutinative languages tend to create very long words with derivational morphemes. Compounds may or may not require the use of derivational morphemes also.
The longest compounds in the world may be found in the Finnic and Germanic languages. In German, extremely 
extendable compound words can be found in the language of chemical compounds, where, in the cases of biochemistry and polymers, they can be practically unlimited in length, mostly because the German rule suggests combining all noun adjuncts with the noun as the very last stem. German examples include (color television set), (radio remote control), and the often quoted jocular word (originally only two Fs, Danube steamboat shipping company captain['s] hat), which can of course be made even longer and even more absurd, e.g. "Donaudampfschifffahrtsgesellschaftskapitänsmützenreinigungsausschreibungsverordnungsdiskussionsanfang" ("beginning of the discussion of a regulation on tendering of Danube steamboat shipping company captain hats") etc. According to several editions of the Guinness Book of World Records, the longest published German has 79 letters and is " Donaudampfschiffahrtselektrizitätenhauptbetriebswerkbauunterbeamtengesellschaft "("Association for Subordinate Officials of the Main Electric[ity] Maintenance Building of the Danube Steam Shipping"), but there is no evidence that this association ever actually existed. The word is so absurd that it was obviously invented as a joke, which is emphasized by the illogical use of the plural of "electricity".
Perger
Perger is a surname, which is an older version of "Berger". The first letter did not change from "P" to "B", which was common in the late Middle Ages. The word "Perg" or later "Berg" means mountain, so the name describes someone, who lived on a mountain. Mostly that persons were related to the government, or they were the governor of their region one millennium ago. Someone in this position was the lord of the mountain. In old German language that would be the "Herr vom Perg" or the "Pergherr", which is the origin of "Perger". The name comes quite likely from the German-speaking part of the Alps, which is Austria (with its languages Burgenland Croatian, Slovene, Hungarian, Czech, Slovak, and Romani), Germany (Bavaria and Baden-Wuerttemberg), South Tyrol in Italy (with its languages German, Italian, and Ladin), and Switzerland (with its languages German, French, Italian, and Romansh), but it could be originated everywhere in the German language area, where a hill or a mountain was populated. In comparison to the name "Berger" it is rather rare. A similar even rarer name with the same meaning is "Pergher" or "Bergher", still displaying the "h". The reason for the varying spellings is the development of the German language in different regions of the German language area and its regions of language transitions in the last thousand years.