WikiTree has comments about the link to Marisco being false genealogy (the Montorency line is the higher-level one).
https://www.wikitree.com/wiki/Montmorency-14
Geneanet's pierfit & zardoz both have his mother as Agnés d'Eû, de Soissons.
//gw.geneanet.org/pierfit?lang=fr&p=agnes&n=d+eu
//gw.geneanet.org/zardoz?lang=fr&iz=1542&p=agnes&n=de+soissons
French Wikipedia has his son Bouchard's mother as an Agnés.
https://fr.wikipedia.org/wiki/Bouchard_IV_de_Montmorency
