New York City just finished replacing the Kosciuszko Bridge, a critical segment of the BQE (I278). Most people in New York say "the koss-key-oss-ko bridge", though my understanding is that the pronunciation is more like "Ko-shuz-kuh"?
Unfortunately, back in the 10th century, the choice of an alphabet was essentially a pure consequence of whom the first ruler of Poland would adopt Christianity from: the Western part of the Church (this was before the official Schism) or the Rus (Ruthenia). The Rus had a liturgy in Old Church Slavonic, and for the liturgical books they adopted an alphabet, the Glagolitic (a predecessor to the Cyrillic), which was more suitable for the phonetics of the language (and, indeed, of Slavic languages in general). Poland adopted the Latin liturgy and the alphabet was part of the “package”.
https://translate.google.com/#view=home&op=translate&sl=auto...
And then there’s ‘ci’, which is pronounced similar to ‘s’…
The closest I can get is ‘Koshch-oosh-kuh’, but that’s still not it (that would be spelled ‘Koszczuszko’).
Everybody was calling her NKM.
https://en.wikipedia.org/wiki/Thaddeus_Kosciusko_Bridge
Also, I pronounce it "Ko-shooz-ko".