Hi -
I have found two marriages and several baptisms which seem relevant:
St Helier parish church -
Marriage: 15 Oct 1629
Pre [Pierre] Darteny [that's how it is written] de St Lo en Normandie et
Jeanne Theodore
.... do you think this is him?
Baptisms: D'ASSIGNY
2.1.1638/9 Philippe fils de Pierre, Recteur de la Parroise de St Helier
(GP - pere, Messire Philippe de Carteret, chevalier, lieutenant-Gouveneur de ceste Ille)
15.3.1642/3 Marius fils de mr Pasteur de ceste Eglise
St Martin parish church -
Marriage: D'ASSIGNY 20.9.1654 Mr Pierre, Pasteur de St Mt. m (3n) Marguerite Nicole fe Richard et Susanne Mallet sa femme.
Baptisms:
D'ASSIGNY
9.5.1652 Jean fs Pre [Pierre - I think]
5.9.1655 Margte fe Pre
10.9.1656 Pre fs Pre et dlle Margte Nicolle
18.11.1657 Margte fe Pre et mse Margte Nicolle.
So presumably Pierre D'Assigny was married to Jeanne Theodore, in Jersey 1629, re-married to Elizabeth in London, 1636, and had Philippe, Marius and probably Jean before Elizabeth died. He then re-married Marguerite Nicolle in 1654, and they appear to have had three more children - Marguerite 1 (who must have died young), Pierre and Marguerite 2.
Do you think this might be right?
If the first marriage is correct, you have a good lead to the French parish records in St Lo, Normandie, for his birth and family there.
If you are not familiar with the French vocabulary let me know - and I will explain.
Mike