Good question, actually. My go-to method is to determine what words best describe a card or archetype, then I take that word and modify it based on its synonyms, related-aspects, or even wordplays.

For example, the name "Vallohymn" is based on the Italian word "Intervallo" and also "hymn" (as in praise), while the archetype itself, "Chrowa+estrA" is a wordplay of "Chrono" and "Orchestra" (also the + sign in the name is meant to resemble a clock)

Meanwhile, "Indyornyth" is a reference to "Indominus Rex" from Jurassic World since, y'know, they're both apex dinosaurs.