I hate it. Multiples are individuals that just happen to be born at the same time. They aren't a litter of animals. Giving cutesy names reinforces that they are "the triplets" instead of their own people, and frankly, I am a judgy person and I judge parents that give their multiples cutesy names.
"Okay, what are your ideas?
Taylor? Uh-huh.
Fletcher?
Cooper?
Tanner? Where are you getting these? The Big Book Of Medieval Professions?"