Editing Old Prussian language (section)

===Onomastics===
There was Prussian toponomy and hydronomy within the territory of (Baltic) Prussia. Georg Gerullis undertook the first basic study of these names in ''{{lang|de|Die altpreußischen Ortsnamen}}'' ('The Old Prussian Place-names'), written and published with the help of Walter de Gruyter, in 1922.{{r|GerullisPlace}}

Another source are personal names.<ref name="Trautmann">{{cite book|first=Reinhold|last=Trautmann|author-link=Reinhold Trautmann|title=Die altpreußischen Personennamen|trans-title=The Old Prussian personal names|language=de|publisher=Vandenhoeck & Ruprecht|place=Göttingen|orig-date=1925|date=1974|isbn=3-525-27302-9}}</ref>