The birth location for William EASTER, Birckia how did you find it?
The nearest I have found is William EASTER bpt 7 Jan 1827 Bircham Tofts Norfolk.
Parents John and Sophie nee BOLTIN. They were married 30 Jul 1826 Bircham.
This could easily be a different family but if you havent been able to trace them on 1841 census possibly worth following up.