Full Idea
Perhaps the notion of a proper name itself involves essentialism.
Gist of Idea
Maybe proper names involve essentialism
Source
Alvin Plantinga (De Re and De Dicto [1969], p.43)
Book Reference
Plantinga,Alvin: 'Essays in the Metaphysics of Modality' [OUP 2003], p.43
A Reaction
This is just before Kripke's announcement of 'rigid designation', which seems to have relaunched modern essentialism. The thought is that you can't name something, if you don't have a stable notion of what is (and isn't) being named.