from John Myer's tree at Ancestry.com:
The date of birth of John Hoover, the founder of "Necessity," has not
been learned, but it is known that one of his nine or more children
was
born in 1748, and since two of his sons do not appear to have
accompanied
their parents to Maryland, the probability exists that they were born
earlier and that they had already established their own homes
elsewhere,
prior to the mid-career Maryland migration of their father. Their
birth
during the 1740's, sugests that he was born during the early 1720's or
before. Because of that uncertainty, together with the uncertain date
of
his father's immigration, it cannot be determined whether or not he
was
of American birth. If the identification is correct, John's first
Maryland migration was to the Frederick County area East of the
Monocacy,
where he apears to have tarried a few years before settling just South
of
the Mason-Dixon Line, as established in 1767, at the two springs, at
the
head of Spring Run, near the present village of Ringgold, in the
morning
shadow of South Mountain. From real estate records it is known that
his
wife bore the Christian name of Mary, and Mrs. Hoover tells us that
her
maiden surname probably was "Watson." Having noted that on August 29,
1769, he had purchased a farm from Sarah Watson, Executrix, and
William
Watson, Executor, of the Estate of David Watson, it was attempted to
strengthen her conjecture by examination of that Deed, only to
discover
that John Hoover had actually purchased "Harry's Grove," or Grave, as
sometimes appearing, from Michael Miller, who had not received his
Deed
thereto from the then deceased David Watson, and as recited in their
Deed
to John Hoover, it was being so executed at the request of Mr. Miller.
Since early Lancaster County marriage records have not been preserved,
the source of Mrs. Hoover's information has not been learned.