Although this man is named Jean Claude or some variation of that name, the LANDRY name is pure speculation.

Loudun is 60 km south-west of Tours. Tours, as Can be seen from a map of France, is located on the
beautiful Loire, a French river rich both in grape vines and regal history. Loudun, to give a further
directional fix, is but 20 km south from Candes, a small community located in one of the south pointing
elbows of the many elbows of the Loire. The French Canadian and Acadian Genealogical Review
(FCAGR), p. 56, says, that there is an "ancient parish," "Saint-jean d'Angely," where, in the registers, will
be found "a goodly number of Acadian names," including: Babin, Bourgeois, Brun, Daigre, Dousset,
Dugas, Godet, Landry, LeBlanc, Martin, Richard, etc.

From, "Acadian Genealogy Exchange", Vol. XXII, No. 2, pp. 39-42, 'Steve
White's Corner' - Response to letter from Dr. Donald J. Landry of Metarie,
LA:

"Without doubt there is no other great Acadian family whose origin has been
the object of such speculation and even fantasy, as the LANDRYs. As a
result, what we know about the first LANDRYs from France is unfortunately
embedded in a melange of confusion and errors.
Four people named LANDRY, all of whom were born in France, appear on
the Acadian census of 1671, 1678, 1686 and 1693. Two were brothers (sic for
male), both named Rene and two were women, named Perrine and Antoinette.
Most researchers presumed that these four LANDRYs were all from the same
family, but that's not the case. Actually, even if it was possible for us to
show that Antoinette LANDRY was the sister of one of the two Rene's (Rene
the elder) and that we could believe that Perrine LANDRY was also his
sister, we have also proof that these three people could not be connected to
the other Rene (the younger) inside of the third degree of consanguinity.
The proofs to which we make reference are found in the dispensations, or
lack of same, in marriage records of LANDRY descendants.
As for the line of parentage between Antoinette LANDRY and Rene LANDRY
the elder, we find that in the marriage of Francois BRUN, great-grandson of
Antoinette and Madeleine DUPUIS, great-granddaughter of Rene the elder, done
at Port Royal October 24, 1735, a dispensation from the fourth degree of
consanguinity was granted. Moreover, there exist in the area of eight other
marriage records between great-grandchildren of Antoinette and
great-grandchildren of Rene the elder, where equal dispensations were
written.
I might mention that two of these eight records to which we come to make
allusion, are mentioned in an article on the subject of LANDRYs that Father
Patrice GALLANT published in 'Cahiers de la Socete [sic] acadienne' in 1972
(Vol. IV, pp. 271-273). Unfortunately, in this article Father GALLANT hid
the relationship between the LANDRYs in confusing the father and mother of
Madeleine DUPUIS, Jean DUPUIS and Anne RICHARD, with another couple, Jean
DUPUIS and Marguerite RICHARD who were in fact the nephew and cousin Germain
of the two others. By chance, the two DUPUIS couples count each one a
descendant of the LANDRYs, but the mother of Madeleine DUPUIS, Anne RICHARD,
actually was the granddaughter of Rene LANDRY the elder, while Jean DUPUIS
who was Marguerite RICHARD's husband was the grandson of Rene LANDRY the
younger. Father GALLANT thus confused the two Rene LANDRYS and consequently
thought he had discovered a dispensation to prove that the two Rene's were
brothers. But the dispensation in Francois BRUN and Madeleine DUPUIS's
marriage record on which it is based, only gives us additional proof of the
relationship between Antoinette LANDRY and Rene LANDRY the elder.
Given that the spouses of Antoinette LANDRY and Rene Landry the elder
were both BOURGS, it seems that one could explain the dispensation granted
in the marriages between their respective great-grandchildren as well as
presuming that Antoine BOURG and Perrine BOURG were brother and sister, that
is supposing that Antoinette LANDRY and Rene LANDRY were brother and sister.
Happily, there are ways to resolve this dilemma. Perrine BOURG married Simon
PELLETRET before becoming the wife of Rene the elder and the two PELLETRET
daughters left many descendants. At least seven marriages took place between
the grand children of the two PELLETRET sisters and great-grandchildren of
Antoine BOURG. If Perrine and Antoine had been brother and sister, the
marriage records of these seven marriages should have mentioned
dispensations from the fourth degree of consanguinity, but no dispensations
occurred. We then are able to eliminate the possibility that Perrine and
Antoine were sister and brother, leaving us to the conclusion that we can
accept as being sufficient proof that Antoinette LANDRY was the sister of
Rene the elder.
The widow Perrine LANDRY who married first Jacques JOFFRIAU was counted
on the Port Royal censuses for 1671 and 1678 as being beside the home of
Laurent GRANGER and Marie LANDRY. Given that Marie LANDRY was the daughter
of Rene LANDRY the elder, there is room to suppose that a sufficient close
relationship existed between Perrine and Rene the elder. Perrine was 60
years old in 1671 and Rene the elder was 53, so it is then possible that
Perrine was also his sister. Unfortunately, Perrine did not leave any
descendants in Acadia, so there is no other possible way to find proof that
we can mention regarding Antoinette LANDRY.
On the other hand, Rene LANDRY the younger was not of the same family as
the others. We can agree to this starting with the lack of dispensations
from relationship in the marriage records of his descendants who married, as
with those of Rene LANDRY the elder and Antoinette LANDRY. We mention that,
for example, of Germain DUPUIS, grandson of Rene LANDRY the younger and
Marie GRANGER, great-granddaughter of Rene the elder, in the registres of
Grand- Pre dated November 3, 1717, which discloses no dispensation from
consanguinity. Even if the two Renes had only been cousins Germain, a
dispensation from the fourth degree would have been necessary in the
marriage.
As for Antoinette LANDRY and Rene LANDRY the younger, we note that there
was no other dispensation of relationship in the marriage record of Joseph
LANDRY and Marie Josephe BOURG (at Grand-Pre Jan. 11, 1745), of Francois
LANDRY and Dorothee BOURG (at the sample place November 21, 1731) and of
Jean DAIGRE and Madeleine LANDRY (again at Grand-Pre November 6, 1721). Of
these three couples, the LANDRYS were grandchildren of Rene LANDRY the
younger and their spouses were grand-children of Antoinette LANDRY. We can
then exclude the possibility that Rene LANDRY the younger was the brother,
or even the nephew, of Antoinette LANDRY.
Some researchers are under the impression that the ancestor of the
LANDRYs was Jean Claude LANDRY, spouse of Marie SALLE, but no one of this
name appears in any document concerning Acadians from the beginning.
In the censuses of 1671 and 1678, the deceased husband of Marie SALLE is
simply called Jean (or even Jehan according to the 1671 census) Claude. A
researcher with a lot of imagination added LANDRY to the name of Jean Claude
in order to explain why Marie SALLE lived between Rene LANDRY the younger
and his son Antoine LANDRY on the census of 1686. It was long presumed that
this Marie SALLE was the same as the one who was married to Martin AUCOIN at
LaRochelle in 1632, which could be true and that she was related, by the
first marriage to Michelle AUCOIN, to the daughter at whose home she lived
in the censuses of 1671 and 1678, which is also possible. The only way the
researchers could prove the association of Marie SALLE to Rene LANDRY the
younger was in transforming her husband Jean Claude to Jean Claude LANDRY
and in presuming moreover that this would be the father of Rene the younger.
We add that this reasoning doesn't hold water. It isn't logical to suppose
that the family name of Jean Claude was omitted by two distinct census
takers. we note that there are those who have already rejected the faulty
idea that the second spouse of Marie SALLE was a LANDRY and have even
advanced the hypothesis that he was an Amerindian. This is possible, but we
mention that it is also possible he was a Frenchman because CLAUDE was a
distinguished family name in French households in the 17th century. Censuses
give us no other indication of the origin of Jean Claude so his origin as
all the French origins of the LANDRYs, too, remain to be determined."