Van Snyder says
Managers of Mathilda (Mathilde) "Maud" de Clermont, comtesse de Dammartin,
I am contacting you about this profile: https://www.geni.com/people/Mathilda-Mathilde-de-Clermont-comtesse-...
She is probably the same person as
https://www.geni.com/people/Mahaut-Mabile-Danmartin/600000001358963...
which lists her husband as Adulf de Braci II, with the same parents and siblings, but as the mother of only Mercelin de Braci.
I have curated this whole area today and especially several generations of the offspring of Renaud de Clermont.
I have found absolutely no evidence for a name for the wife of Adulf de Braci, so I have removed his wife's name and replaced it with NN, thereby making moot the question of whether she was the same as Mathilde de Clermont.
Thanks for bringing this to our attention, William.