I just about never call Vinyl by her official title. “DJ Pon-3.” I think Twilight said it once or twice in the show and it’s a little awkward for regular conversation. Four syllables compared to the three of “Vinyl Scratch.” Unless you count the ‘tch’ of ‘scratch’ as a separate syllable. Do you? The thought keeps me up at night. (not really)
She’s even been referred to as Vinyl Scratch in the fairly recently announced third issue of the My Little Pony/Transformers crossover sequel. <3