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Typically when one word ends in a consonant it is dropped and becomes the first sounds of the next word if it begins with a vowel (liaison).
Dulcos est un homme.
Why is the s in Duclos not sounded when followed by est then?
What is the exact rule that governs that?
Because this is forbidden following a singular noun and a first name is subsumed under that. It's not obvious it is but the following example from Le bon usage 14 (Grevisse & Goosse) § 44 c in the "liaisons inusitées (outre les cas où il y a pause ou disjonction)" [irregular (except for when there is a pause of disjunction)] section, makes it clear: "après la consonne finale d'un nom au singulier [following the final consonant of a singular noun] [...] Vincent | ira [will go/will be going]".
En résumé la liaison est interdite/inusitée après la consonne finale d'un nom au singulier et un prénom est assimilé à un nom au singulier tel que l'illustre l'exemple au LBU14 § 44 c) « Vincent | ira ».
