I select hostnames drawn from the ordinal numerals of whatever language I happen to be trying to learn. Recently, it was Japanese so the first host was named “ichiro”, the second as “jiro”, the third as “saburo”.

These are the romanized spellings of the original kanji characters: 一郎, 二郎, and 三郎. These aren’t the ordinal numbers per-se (eg first, second, third) but are an old way of assigning given names to male children. They literally mean “first son”, “second son”, “third son”.

Previously, I did French ordinal numbers, and the benefit of naming this way is that I can enumerate a countably infinite number of hosts lol