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This should answer your question about entropy: https://en.wikipedia.org/wiki/Entropy_(information_theory)

tl;dr If you use names that are similar to other names, you will convey less information every time you use such names. So pick a name which doesn't require additional bits to disambiguate.

Note that English conveys roughly 1 bit of information per word.

Note that English conveys roughly 1 bit of information per word.

I think that's per character, not word.

Maybe he's using UTF-16.

It's just a fancy way to say names that have rarely been used. (In compressed data, commonly used strings are represented using fewer bits.)

You could estimate this by doing a search.

The Linux 'perf' tool is one of the canonical examples.