Usually spelled "Hyslop" in Scotland or "Heslop" in England, it's an English/Scottish border name. Looking at the Ancestry.com name origin tool, it shows that in 1841 (the farthest back it goes), Hyslop/Heslop was most common in Dumfriesshire, followed by Kirkcudbrightshire, with Lanarkshire and Ayrshire also having some. Note that they're all in the south of Scotland.
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