Full Idea
A proper name like 'Goliath' denotes a thing in the actual world, and invokes a sortal with certain persistence criteria. Hence its origin makes a statue the statue that it is, and if statues in different worlds have the same beginning, they are the same.
Clarification
A 'sortal' term says what sort of thing it is
Gist of Idea
A particular statue has sortal persistence conditions, so its origin defines it
Source
Allan Gibbard (Contingent Identity [1975], III)
Book Reference
-: 'Journal of Symbolic Logic' [-], p.195
A Reaction
Too neat. There are vague, ambiguous and duplicated origins. Persistence criteria can shift during the existence of a thing (like a club which changes its own constitution). In replicated statues, what is the status of the mould?