The name Sūduva, according to Vytautas Mažiulis, derives from a local hydronym*Sūdvā, in turn derived from a Baltic verbal root *sū-: to flow, pour. A. S. Kibin proposed Yotvingian, or the "Slavic Jatviagi as the group name goes back to O. N. patronymic derivative játvingar meaning « the descendants of Játvígr », or « the people of Játvígr »" - "the name Játvígr mentioned by Knytlinga saga". J. Pashka, acknowledging Kibin's proposal, has similarly interpreted the ethnonym as derived from the Old NorseJátvígr, with a genitive Játvígs liðsmenn label of Játvígr's Viking expedition and his Norse Rus' settlers by the Nemunas river. Pashka asserts the nasal infixation in the original Old Norse Játvíg name of the 944-945 Kiev Treaty was probably an insignificant scribal error or misinterpretation, that has survived to the present.
History
According to The Histories of Herodotus , the Neuri Νευροί were a tribe living beyond the Scythian cultivators, one of the nations along the course of the riverHypanis, west of the Borysthenes. This was roughly the area of modern Belarus and Eastern Poland by the Narew river, coinciding with the Yotvingian linguistic territory of toponyms and hydronyms. In 944, during the treaty between the Kievan Rus' prince Igor and the emperor of the Byzantine Empire, the Yotvingians were hired by the Kievan ruler to serve as mercenaries. Also Vladimir I of Kiev, in 983, hired the Yotvingians to add to his army. Ptolemy in the 2nd century AD called the people Galindai kai Soudinoi. Peter von Dusburg called them Galindite and Suduwite. In the Hypatian Codex the spellings are changing: Jatviagy, Jatviezie, Jatviažin, zemlia Jatveskaja, na zemliu Jatviažs´kuju and more. Polish sources also used Russian spellings: Jazviagi, Iazvizite, Jazvizite, Yazvizite. In the treaty with the Teutonic Knights in 1260, the region is called "terre Getuizintarum". This name was taken by the papal administration: terra Jatwesouie, Gretuesia, Gzestuesie, Getuesia und Getvesia. The Knights called this tribe Sudowite, Sudowia, in qua Sudowit. In the sentence of Breslau of the emperor Sigismund of Luxembourg to the Order of Livland from 1325, this area is called Suderlandt alias Jetuen. In two dotations of Mindaugas I, a new name was recorded: Dainava, Deynowe, Dainowe, Denowe. The forests were named Deinova Jatvež. Yotvingians also had a strong warrior culture and were generally well known as great warriors and hunters, and were feared by their neighbours for their skill in warfare. Skalmantas, leader of the Yotvingians was responsible for single-handedly raiding Pinsk in the Principality of Turov. A census by the clergy of the Belarus Grodno area in 1860 had as many as 30,929 inhabitants identifying as Yatviags.
Marija Gimbutas, The Balts. London : Thames and Hudson, Ancient peoples and places 33, 1963.
Totoraitis, J., Sūduvos Suvalkijos istorija. Marijampolė: Piko valanda. .
Witczak, K. T., Traces of Dual Forms in Old Prussian and Jatvingian in Woljciech Smoczynski and Axel Holvoet, eds, Colloquium Pruthenicum primum, 1992, pp 93–98
Gerullis, G., Zur Sprache der Sudauer-Jadwinger, in Festschrift A. Bezzenberger, Göttingen 1927
Toporov,V., ИНДОЕВРОПЕЙСКЕ ЯЗЫКИ Лингвистический энциклопеический словарь. Moskva, 1990, pp 186–189