Hi there
This is a bit of a stab in the dark, but I am trying to trace Hannah Butler nee
unknown 
There is a possibility that her maiden name is HAYTER.
I have Hannah Butler born between 1811-1816...in Sulgrave, Northamptonshire on census records 1841-1881, she died in 1883. (I have 2 censuses that put her DOB in 1811, and her death reg would also confirm this.)
Her first child, Elizabeth Butler, was born in Grendon Underwood, Bucks late 1832, so she would possibly have gotten married in 1831. She married a William BUTLER, of Grendon Underwood, Bucks.
I don't appear to have a marriage on record in Grendon Underwood, so am assuming that the marriage took place in her parish? (Or hoping!

)
Elizabeth Butler went on to name one of her sons Frederick Hayter...and following the tradition of using a mother's maiden name as a sons middle name, I'm hoping that this is the case in this instance.
TIA
Daisy Loo