There's a marriage between a George Evans and Sarah Bevan in Sep qr 1862, Oswestry, 6a-1119. You might need the certificate or a parish records look-up by someone in order to find the name of George's father.
There are two George Evans in the 1861 in Oswestry and no obvious way to say which is yours. There are two hints in that one has a father called Thomas and George called his first son Thomas and the other George is working as a blacksmith but not enough to rely on.
1861 - RG9/1878/113/7.
All EVANS.
Beatrice Street, Oswestry.
Thomas, Head, M, 38, Cork Cutter, b Oswestry.
Elizabeth, Wife, M, 23, b Newtown, Mont.
George, Son, S, 21, Cork Cutter, b Oswestry.
Thomas Charles, Son, 1, b Oswestry.
This looks like George was from an early marriage and Elizabeth is wife No. 2.
1861 - RG9/1879/10/14.
St Martins, Oswestry.
William Jones, Head, M, 31, Blacksmith, b Chirk, Denbighshire.
Catherine Jones, Wife, M, 27, b Chirk, Denbighshire.
Margaret Jones, Dau, 6, b Ruabon, Denbighshire.
Ann Jones, Dau, 3, b Llangollen, Denbighshire.
Edward Jones, Son, 7mths, b St Martins, Shropshire.
George Evans, Servant, 21, Blacksmith, b St Martins, Shropshire.
Harriet Clay, Servant, 16, b. St Martins, Shropshire.