Not getting consistent results for Robert Wilkins either, and NO primary documentation.
Apparently *a* Robert Wilkins was born in Deddington, Oxfordshire, circa 1565, and *a* Robert Wilkins married a Margaret Lewis of "Lysdale", Essex. But -- were they the same man?
Complicating the matter is that "Lysdale" no longer seems to exist, and is referenced ONLY in family trees for Robert Wilkins, Margaret Lewis, and (sometimes) their son(s).
There are indications of mash-merging on Thomas Wilkins, stated on various family trees to have been a son of Robert and Margaret. His dates are sometimes given as 1584-1590, which is absolutely incompatible with conflicting claims that he married Hannah Nichols and fathered Bray Wilkins of Massachusetts (another Wilkins with NO proven ancestry, BTW). Moreover, his "birthplace" is sometimes given as Somerset, and it is sometimes claimed that he died in Tetbury, Gloucestershire, England - which are plausibly related to each other but NOT to Essex.
Semi-consistent claims that Margaret Lewis died/was buried in 1594 do not compute with the probable birth date of 1599 for John Wilkins I (age stated as 26 in the 1624/5 Muster roll).