I know you're probably not the one who came up with the name, but I think Octavian or Octavius would work better, seeing as those were the inspiration for Tavi's name in the first place. Plus, being the name of a Roman emperor, it shows a lot more class than just a common Spanish name.
I think the conversation between them would be something like this:
Octavio: "Why, it's such an honor to meet a fellow musician like yourself, Miss Octavia." Octavia: "I couldn't agree more, Mr. Octavio. You play a divine cello." Octavio: "You too. I was close to tears when I heard you play. You handled Warlander impeccably." Octavia: "And you're such a gentlecolt, too. But I bet you say those things to all the mares, don't you?" Octavio: "Miss Octavia, I wouldn't dream of it. I'm not easy to impress." Octavia: "Neither am I." Octavio: "May I ask a question?" Octavia: "Why, most certainly." Octavio: "Who was your most beloved idol?" Octavia: "Well, I was raised in rich conditions and my family was an early influence. But the one that really inspired me was none other than Lead Wheelerstein. I listened to all his recordings, went to all his concerts and I even got my music lessons from him." Octavio: "Oh! It must have cost a fortune." Octavia: "Like I said; we weren't exactly the poorest family in Canterlot. My family spent all money necessary for my education. And it paid off in the end, too, because I received my cutie mark shortly after that." Octavio: "Why, that's a very inspiring story!" Octavia: "What about you? Did you have any idols growing up?" Octavio: "I had more than one, actually: Shire, Fratello, Salerno..." Octavia: "The most important ones." Octavio: "Exactly!" Octavia: "Did you take lessons?" Octavio: "Yes, but I went to a private school. I didn't get my cutie mark until my very first concert, though." Octavia: "Ah, I see." Octavio: "Now, I hate to be the one to end this conversation, but I need to go and pick up my roommate." Octavia: "You have a roommate? What's he like?" Octavio: "Oh, he's a DJ... makes terrible music, though." Octavia: "Hey, that sounds just like my roommate!" Octavio: "Messy blue mane?" Octavia: "Yes!" Octavio: "Pale white coat?!" Octavia: "Yes!" Octavio: "Sunglasses?" Octavia: "Can't leave home without them!" Both: "AND HE/SHE MAKES TERRIBLE MUSIC!"