Name: Hannah is commonly found on the internet as possibly being Hannah Lamb, the daughter of Edward Lamb born 10 December 1633 in Watertown.  No evidence has been found to support this identification. Anderson, in his Great Migration profile of Edward Lamb, states that no further record has been found regarding Hannah Lamb besides her birth record.  It is not an impossibility that this is true, just apparently not proven and without evidence. It should be noted that the Watertown lands of Edward Lamb and John Knight were immediately adjacent to each other. 
Holman, in her Stevens Ancestry, calls her Hannah [Russell?].  The basis of calling her possibly Russell is not known.
Born: Say 1630.
Date is a rough estimate based on her first child being born in 1651. A date of 10 December 1633 can often be found on the internet but this is due to the likely error that she was the Hannah Lamb born on that date.
Marriage and Children
Married: Hannah Unknown, before 10 December 1649.  On this date, he sold his house in Watertown with Hannah his wife, and removed to Woburn.  She is sometimes said to be Hannah Lamb, or Hannah Russell - neither of these names are proven (see errors below).
Sewall, Samuel. The History of Woburn, Middlesex County, Mass., from the grant of its territory to Charlestown, in 1640, to the year 1860 (BVoston, 1868):623-624. Archive.org LINK
Watertown, Watertown Records: Comprising the first and second books of town proceedings with the lands grants and possessions, also the proprietors' book and the first book and supplement of births and deaths and marriages. (Watertown: Historical Society of Watertown, 1894):3. Archive.org LINK
Anderson, Robert Charles. The Great Migration Begins: Immigrants to New England 1620-1633, vol. 2 G - O, (Boston: NEHGS, 1995):1151. AmericanAncestors.org (paid) LINK
Where does the 10 Dec 1649 Watertown marriage come from? I'm looking at the Watertown Vital Records (volume 1, pp 13-15) and there is no such marriage recorded there.
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[Do you know Hannah's family name?] | K > Knight > Hannah (Unknown) Knight