Just Nostr. A nickname is not going to catch on at this point. I've only ever seen it referred to as Nostr. It's got the first mover advantage. I always explain that Nostr stands for Notes and other stuff transmitted through relays. How the hell am I going to explain that if I refer to it as Nostrovia? I'm not, so I won't. I'm evangelizing the hell out of this platform, and this is how I do it.