Louis Desportes and Anne Duposteau were actually a married couple who lived in Paris, say, about the middle of the 16th century. Anne Duposteau was the wife of Dominique Jobelin, avocat au Parlement; their daughter Anne Jobelin married, in 1574, Robert Danes / Dannes, receveur des tailles à Rouen, notaire, secrétaire du roi etc. Anne Duposteau, after the death of her first husband Dominique Jobelin, married Louis Desportes, conseiller et secrétaire du roi, avocat au parlement, and had more children. This from Le Marois's excellent research
https://www.lemarois.com/jlm/data/r16delamouche.html
I don't see anything that would confirm that these two people were the parents of Pierre Desportes, even though Madame's son-in-law had an office in Rouen (Pierre's place of origin). But this certainly explains where the names come from.
A quick search on Généanet yields 541 entries for the Desportes/Dupoteau pair, all user contributed trees.
Of these, a minority (about 5%) of contributors provided a source, which is always an online tree (mostly Ancestry, but a few provide the WikiTree profile instead).
They disagree over their place of origin/where they lived, which is given as either Paris or Lisieux, au choix, without any evidence backing up either hypothesis.
A minority of entries give parents for either Louis or Anne; but those that do, generally provide a mother called either Marguerite, or Élodie, or... Collineau... de Montaguerre, bien sûr (same mother for both husband and wife, of course).
Conclusion: no evidence that Louis Desportes and Anne Dupoteau were the parents, but ample evidence that there was no solid research done where they are presented as such.
