I like short and simple names, so when learning new taxons, I remember the simpler of the two of common name vs. scientific name. When I need to refer to the other name, I check iNat Taxa Info.
I’m better at remembering names that I find esthetically pleasing. Hence, the beautiful junior synonym Chrysalidocarpus is easier for me to remember than the ugly accepted name Dypsis. Likewise, the same tree’s common names: to me, it will always be Butterfly Palm (which brings to mind the image of a butterfly), not iNaturalist’s default Areca Palm (which brings to mind someone spitting betel nut juice), even though both those names have the same number of syllables.
As a hawkwatcher who is privileged to see a bunch of them, I have to say that Merlin shouldn’t have a two-syllable name. You’ve barely got time for one syllable before they’re past you!