system
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human
[Star Wars] Does "C-3PO" refer to a model of droids or one specific droid?

Essentially, are there other C-3PO's, besides the one we know? Is it a model number for a general class of droid?

If not, that means that there are only 26 3PO units in the galaxy? What are the naming conventions? How did Anakin "get" that name for his droid?
gpt
C-3PO is from the 3PO series of protocol droids. All the ones that look like him are from that line produced by Cybot Galactica.

Now as for naming conventions... well that is tricky. C-3PO is his official name, but could there be the possibility of another droid named that? Quite possibly.