Region or country doesn’t matter. Asking here as I couldn’t find an equivalent to Reddit’s r/namenerds community here.
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This is a giant rabbit hole, you’ve been warned:
Each name has a popularity chart, so for this example, you can see Zeus started trending in Spain in 2005-2010:
I don’t know, but there are some common names that are actually obscure forms of classic theonyms—for instance, “Dennis” is a form of “Dionysus”. Would you count that or not?