Then the rest of the article misspells it by dropping the Z!
As mentioned, it's also the name of Australia's highest mountain[0]. Named by the explorer Strzelecki.
0. https://en.wikipedia.org/wiki/Mount_Kosciuszko
Wikipedia claims that there are three Australian mountains higher than Mount Kosciuszko, but two of them are on land that only a few countries recognise as Australian.
https://en.wikipedia.org/wiki/Mawson_Peak
Then the rest of the article misspells it by dropping the Z!
As mentioned, it's also the name of Australia's highest mountain[0]. Named by the explorer Strzelecki.
0. https://en.wikipedia.org/wiki/Mount_Kosciuszko