The aim of the article is an attempt to trace the fate of several appellatives grouped in the lexical field around the hyperonym świnia ʽpig, swine’ (wieprz ʽhog’, knur/kiernoz ʽboar’ and prosię ʽpiglet’) as the motivation of many names in Polish onymy, mainly in anthroponymy and toponymy. My research has been conducted along the lines of historical anthropology. Proper names in this approach play an important role in the reconstruction of the past. The field of interest of this article includes mainly names belonging to the old onymic layer. Proper names arise from the lexicon of a given language, which is why my analysis is based on lexical and semantic methodology. My point of departure is the meaning (often reconstructed) of appellative lexical units, including their semantic modifications in the proprial layer. I interpret proper names on the basis of findings regarding their origin and motivation. The first names motivated by the lexeme świnia were associated with the economic organization of the Piast state. In the article I present the history of their creation. I go on to discuss the other lexemes which became the basis of many names belonging to different naming categories. The presence of etymons of interest to us in so many proper names during the Middle Ages allows us to draw the conclusion that pigs played an extremely important role in the lives of our ancestors.

The article is devoted to more comprehensive use of medieval onymic resources in research on the history of the Polish language. These materials were used in research on the phonetic development of the Polish language in its earliest period. To date, they have rarely appeared in lexical studies. The body of the oldest appellatives, reconstructed on the basis of proper names, would be a kind of lexicon (supplement) enriching and verifying old Polish lexical material, certifi ed in historical Polish dictionaries (also in etymological dictionaries). In this way, the expectations formulated over 100 years ago by eminent Polish linguists may be fulfi lled. The complementary use of such a huge wealth of material opens up further research perspectives towards etymological, dialectological, lexical and morphological research.