I've mentioned before about not getting overly precious with family name spellings and my Grandfathers line Shields is no exception.
My first Shields I have documented in my family so far is John Shields marrying Isabella Slavin in 1860. As he couldn't write he signed by an X and his name was written by the registrar John Palmer, witnessed by Andrew Black who was the Parish Priest.
Over the next few years the name crops up in the same family with different spellings, Shiells, Shiels, Shields.
Shields Name Meaning Irish: reduced form of O’Shields, an alternative Anglicized form of Gaelic Ó Siadhail ‘descendant of Siadhal’. Northern English and Scottish: habitational name from a pair of places in Northumberland and County Durham (now both in Tyne and Wear) called North and South Shields, named with Middle English schele ‘shed’, ‘hut’, ‘shelter’. There has been much confusion between Shields and Shield and their variants.
Shiels Name Meaning Scottish and Irish: variant of Shields.
Spellings worth checking
Shiel, Shiell, Shiels, Shiells, Sheil, Sheill, Sheils, Sheills, Shield, Shields, O’Sheil, O’Shields