The story
Ultimately from the Old Prussian name for the region, Sūdawa.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A region of the Baltic, initially inhabited by the Sudovians (also called the Yotvingians), which later formed part of Prussia and is now split between north-eastern Poland and southern Lithuania. Full definition →
Ultimately from the Old Prussian name for the region, Sūdawa.
Etymology from Wiktionary, CC BY-SA 4.0.