Keep it simple with servers these days after going through lots of naming schemes. Two-letter country code and the number of it. Talking to you from my PDS on fi02 atm, which replaced de01. Boring... but easy
Personal devices are named are bird species though
I don't have a set theme, but a couple are marine creatures and a couple are fruits. A subset is just {2 letter country}-#, with a few being {2 country}-{3 city}-#. My laptop is f16 because it's a Framework 16 and... Plane cool? Last laptop was qubit, almost any word starting with q sounds cool.
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also used to do space-themed hostnames before that (they matched with my name lol)
Personal devices are named are bird species though