In the RDF data model things are named with URIs which are essentially just URLs with more precise information appended to them. See here:

@prefix eric:    <http://www.w3.org/People/EM/contact#> .
@prefix contact: <http://www.w3.org/2000/10/swap/pim/contact#> .
@prefix rdf:     <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .

eric:me contact:fullName "Eric Miller" .
eric:me contact:mailbox <mailto:e.miller123(at)example> .
eric:me contact:personalTitle "Dr." .
eric:me rdf:type contact:Person .

Is there any concivable utility in naming entities in RDF using Namecoin?

Maybe immutability? Since DNS hosted domains are subject to disappear over time for whatever reason. As in an NYT article I read that 50% of the links in US supreme court cases are now defunct.

Though I know that really things in Namecoin are not really immutable, they are also subject to change/transferance but maybe they're more persistent than centralized DNS IP system.