A bit of googling reveals the origins of the name Blinco.
https://www.surnamedb.com/Surname/Blinco"This unusual surname appears to be continential but is in fact of combined ancient Celtic and Old Norse origin, and a locational name from a place west of Penrith in Cumberland called Blencow. Recorded as "Blenco" in the 1232 Pipe Rolls of that county, and as "Blenkhaw" in the "Inquisitiones post mortem", dated 1254, the first element of the placename is believed to be the Old Welsh "blaen", top, with the Old Norse "haugr", hill."
Which ties up quite well with his birthplace being Durham.