I have seen a few players on the American server named "Vita." And this makes me wonder if there's some kind of backstory as to why some players chose this name.
Before the 1.1 update, I thought it was only one player that I have seen quite frequently. But then I saw 2 or 3 "Vita"s at the same spot. I am very curious...
Also, I have seen a YouTuber who also named their MC "Vita." After the handheld console PS Vita. However, I am not sure if he continued to play the game as he was just trying it out for a video. I don't remember the youtuber's name but I remember the video. It was about trying out new "Genshin clones." A very click bait-y title but the video was pretty good.
Another thing I saw is the Female Phoxhunter avatar on VrChat is named "Vita" as well.
There is no way there's no lore for this name. I NEED answers. Please. My curiosity can't take this.

Sable
Vita means Life in Latin, and Mors means death in Latin. They are the default names for the female/male MC's provided you don't pick a name. Since multiple people can have the same in game nickname, there are around 7,000+ Vitas. It's literally just a whole lot of people too lazy to pick an account name. xD
M1d0sl
if you don't change the name while selecting your mc the first one is vita (aka phoxhunter) and the second one is mors! (the boy/girl in the dream)
Vicvicludo
Vita is the default name if you don’t put anything