Hello Maythree,
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I don't have the 1851 marriage cert for John Naylor and Elizabeth Powell.
However, all three marriages on the IGI are submitted (with no surnames for wife), rather than collected ones, and to me look as if the submitter was speculating. The only marriage in the BMD registrations in Berkshire is the one in 1841 to Elizabeth Powell.
The 1851 census entry bears out that John was age 32 with a son William, so that seems to bear out that this is your William. You would need to get William's birth cert to be absolutely sure. This is it, I think, the name being spelt in different ways on different documents.
Births Mar 1843 Nailer William Newbury 6 232
I know that on the 1841 marriage BMD that the other two marriages were for Henry Johnson and Ann Sellwood, and Hannah Kimber and Isaac Sanford because they are two of mine.
Vicwinann