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 found https://apps.cdrc.ac.uk/worldnames/ looking up my name but the site is taking a while.
I don’t know, but there are some common names that are actually obscure forms of classic theonyms, and the people using them may not even be aware of the connection—for instance, “Dennis” is a form of “Dionysus”. Would you count that or not?