That's the Old English spelling - or the way it's rendered nowadays. Other versions, seen in placenames particularly, are Law, Lowe and Howe. 'Lowenbrau' - Round hills brewery (perhaps). Sometimes the hills have two names, a local one and an official one. Our hill in Bolton - entirely geological though it has a barrow on its flank - is both known as Sugarloaf Hill, to Boltonians, and Brown Lowe, to Ordnance Survey.
Blakey, the name, still associates with the On The Buses inspector, for me.
"Sugarloaf" is also the English name for Pen-y-Fal in the Black Mountains.
Brown Lowe or Sugarloaf? Which would be the older name? I suppose the answer may depend on when sugar-loaves were invented. "What's that funny looking loaf you've made there Elsie? Looks just like Brown Lowe".