HI Emma
That looks very feasable

plus this lot on the 1851 gives his parents too... all kids born Wales..
In 1851 Living at Coxhoe
John Cunnah 55, born Flintshire, Wales
Susana Cunnah 53, born Flintshire, Wales
John Cunnah 22, born Flintshire, Wales
Joseph Cunnah 20, born Whitford, Flintshire, Wales
Jane Cunnah 13 , born Flintshire, Wales
So only now to find Joseph and Mary's marriage to get her maiden name..
The Vicars Wife