Huh. Think Wooster-sure sauce. The actual name goes all the way back to old Anglo Saxon England, where Worcester was the name of a region somewhere in England and shire is the old term for what is now termed a county, more or less. CK 80's comment leads me to conclude the native anglish, many of them ex pat romans who remained after the Roman Empire collapsed, probably just held on to their version of the word and it "evolved" over time as the language itself grew and changed. Think that the Commonwealth of Mass might still call them shires; not sure.
The whole "Anglo" thing arose from a combination of immigrants known as Jutes, Angles, and Saxons who migrated over to the island at one point in time or another. As for the Normans, well, their name is a corruption of the term "Norseman" or North man, aka Viking, as they had already established settlements in the north of what is now France and used them as beachheads to send raiding and trading sorties over to harass the monks who had bad habits like stashing gold and valuables. Think 1066 if you are into history, otherwise just kick back and enjoy the RIBS!, preferrably with a side of slaw and a too cold to hold beer!! Much better for you than the bones of the dead and the buried.
Nick