Healthy discussion and 'shots over the bow' - good.
Points from your latest - in order:-
1. Agreed, however if I may refer to the 1699 Will of James Trewheela of Scilly we find some similar 'abstract' legacies.
Here is a Transcript of that Will:-
AP/T/1683 The Will Of James Trewheela-Scilly
Proved 15th April 1700
In the Name of god Amen the 29th day of January 1699 I James Trewheella
being Sick and weak In body butt thanks be to God of perfect memory doe make
this my Last will and Testament in manner and (fforme) following
(Imps) I Give and Bequeath my Soull unto Almighty god my maker trusting
that through the (meritorius death) and (passion) of my Lord and
Saviour Jesus Christ hath (purchased ffrom remission) of all my Sins
and my body to the earth to be Desently buried.
Item I Give and Bequeath unto Elizabeth Trewheella Daughter of Thomas
Trewheela ffive pounds
Item I Give unto Phillis the wife of Lambert Martin the Sume of ffive
pounds
Item I Give unto An the wife of Nicholas Briant the Summe of ffive pounds
Item I Give unto Thomasin the widdow of John Penhellerick the Summe of
ffive pounds
Item I Give unto John the Son of John Trewheella the summe of ffive pounds
Item I Give unto William the Son of Martin Trewheella the Summe of ffive
pounds
Item I Give unto James the Son of William Trewheella the Summe of ffive
pounds
Item I Give unto Elizabeth the Daughter of William Trewheela the Summe
of ffive pounds
Item I Give unto William Trewheella {overwritten name Kalensoe}
Living in Penzance the Summe of ffive pounds
Item I Give unto the poor of the parish of St Earth the Summe of Twenty
Shillings
Item I Give unto the poor of the parish of Tewednack the Summe of Twenty
Shillings
Item I Give unto my Bro: William Trewheella a Bond of Six pounds Due
ffrom David (Nennis) which Bond lyeth in the Custody of Matthew
Trewheella with the Interest
Item I give unto Matthew Trewheela all my part of the Commons being Knowne
or Called by the name of the Lady Downes, all the (outt letts)
Item I give unto William Trewheella my Bro: all the (Inclosier) which
is now in the Custody of him the Said William Trewheella
Item I doe Constitute and Appoint my Brother John Trewheella to be my
Lawful Executor and to receive ffrom Matthew Trewheella two bonds
the One of Thirty pounds [due] from William Trewheella the other of
Twenty ffive pounds due ffrom Thomas Trewheella both which bonds I
doe order to pay the Legacies herein Given and Bequeathed And the
[ove]rplus of the money which remaineth unto my Executor who I
(desire may See this) my Last will and Testament performed In witness
whereoff I have here unto Sett my hand and Seale the day and yeare
ffirst above written (Anno Domy) 1699
Signed and Sealed The marke
being on Double stampt of James Trewheela
paper in pr'sence off
[Jam:] Duffe
George Treweeke Jun:
Samson [R]attonbury
I have mentioned this before where it took Zenobia and I probably two years to come to a consensus on the legacies of this Will.
With combinations of other Wills and available data we concluded that Ann BRIANT, Phillis MARTIN and Thomasin PENHELLERICK were sisters of James. (Ann was baptised at St Erth 8th November 1644 d/o James).
Brothers John and William were named as such and some legacies to their children were mentioned.
Of the remaining Trewhella legacies it was determined that these were 'blood cousins' of James and sons of his Uncle Thomas.
It is still very possible that we have not correctly identified everyone in this Will so I therefore 'throw down a challenge'.
2. Godson/Grandson - I also agree to a certain point as I have seen similar references before which have turned out to be as I have previously described.
I do not for one moment suggest that it is the same in every case but always must be considered.
3. I concede (to a point
but, after another very brief look at things will alter my thinking a little.
Whilst not discounting other possibilities you have mentioned - it 'could just be' that Martin Donathon and Samuel Blight were brothers-in-law rather than sons-in-law.
This might explain why only Grace DOUBT was named as a sibling.
In this case it would seem that Martin and Samuel were still living whilst Grace was then a widow.
4. 1641 produces only one Blight (Samuel) and apparently it would be his Will of 1645 which you have pointed out.
There is also no Donithorne evident in 1641 which may be a suggestion that the family was elsewhere - I would suggest most likely in Gulval.
Also - there seems no evidence of either Blight or Donithorne in the 1662/64 Hearth Tax for Zennor.
5. If we remove the Donithorne and Blight scenario as being children of Richard we are then left with (apart from his sister Grace) children Phillip (with daughter Jane), Martin (and his wife) and then Sybill which is a little suggestive of birth order.
My reasoning for nominating Thomas as the eldest son is that he was named Executor and residual legatee.
Also, in the absence of a son named Richard and, now given the possibility Richard was son of a Thomas Davy, it would seem apparent that Thomas might be the eldest living son of this Richard Davy.
6. I think I have referred to this in one of the points above.
7. and 8. Probably now covered in the above.
BTW - When you use the word 'onamastic' do you mean 'omnastic'
Back to you while I check a couple of other things.