I tend to name mine after their physical appearance, though I’m leaning towards space-related names now.
I’ll copy a Discord message I sent someone while explaining my naming scheme:
in chronological order: my very old laptop was black and grey so it was Batman my first build had orange/gold fans so it was Aurum my next build was black and white so it was Mono my current build had lots of RGB so it was Nova (like supernova) my home server has the BitFenix wings logo so it was Flight my laptop is sleek and pretty speedy so it was Comet