Looking into the Silence side of my family I've come across a possible Rounce connection... searching on pilot.familysearch.org I found a reference to a George Silence and Hannah Bounce, but looking at the scan of the actual record the B is quite clearly an R.
Thomas Jeremiah Silence baptized 30th June 1816, Hanworth, Norwich, Norfolk, son of George Silence and Hannah Rounce. Father’s Occupation is listed as Watch-maker.
Would be interested to know if this connects up with anyone elses family research.