It is frequently misspelled, because it is close to being consistent with German orthography, the "ie" being pronounced as a long "e", though the initial consonant would then be spelled "sch". Nonetheless, there is no "c" in the name. Why? Because it is not a German name.
The name is an American invention, applied to my ancestors upon immigration to the US from the city Szczebrzeszyn, currently a part of Poland, and mapped below. During the immigration process, the surname was shortened from the city name, probably from its Yiddish pronunciation shebreshin.
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