Like most surnames ending in -OWSKI, this one probably derived from a place name. OLSHEFSKI is an anglicized spelling of Polish OLSZEWSKI, which is pronounced roughly "ol-SHEF-skee," so that spelling in English makes sense.
The root of the place names, in turn, is the word _olsza_, "alder tree." So Olszewski means basically "person from the place(s) associated with alder trees."
The list of villages this name could refer to is long, as there are quite a few villages named Olszew, Olszewka, Olszewo, so it's not surprising there are a lot of Olszewski's in Poland.
As of 1990 there are some 44,638 Olszewski's with variant spellings, living all over the country!
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William F. "Fred" Hoffman
Author, Polish Surnames: Origins & Meanings
Publications Editor, Polish Genealogical Society of America
www.pgsa.org