The spelling of Sherritt is a derevation of Sherratt.I've only seen it spelled that way in Scotland.There is a confusion for the Scherretz of which at some point in time on the east coast of the U.S. adopted the surename Sherrod.Which is believed to be a corruption of Sherratt in the U.S. I came across many Sherritt surenames in the Gloscow area of Scotland as well as Aberdeen on a resent trip there.The ancesteral area is that of Staffordshire, England.In addition, Sherratt's are akin to all Sherrards.Including Ireland.
Confused yet??The name goes back to 912 a.d. in staffordshire for a saxon fort built to fend off danish invaders.i believe it was spelled "scirgeat" meaning "bright gate".
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p.s. If you take our surenames back far enough in time,we are related.