Bautzen.

From Middle High German Būdessen (and spelling variants), from Old Sorbian. Cognate with Upper Sorbian Budyšin, Polish Budziszyn. First attested in a Medieval Latin text as Budusin in 1002. The German form is an entirely regular outcome of the Slavic: Postalveolar -š- was borrowed as retracted Middle High German -s-, and Modern German diphthongisation and syncope then yielded Bautzen. The further origin is uncertain, but probably Slavic, with suggestions including: * Named after a prince called Budissentius, Budestaus, or alternatively a female *Budiša, from Proto-Slavic *buditi (“to awaken”). Compare names like Budigost, Budimir, Budislav. * Some sources derive it from the Slavic name of the Ortenburg castle in Bautzen, which is given as Budetzsch, but they do not explain it further. A derivation from Upper Sorbian buda (“hut”) is highly unlikely as this is a Germanic loanword. * Bautzen legend/folk etymology explains the name by a tale in which a traveling duchess gave birth in present-day Bautzen, during which the rushing husband asked budeli ssen, or perhaps in modern Upper Sorbian budźe syn? (“will it be a son?”). Compare also Bautzen at German Wikipedia.