Kiran username

It's the default name.

mine is Kiran, and I think many are the same way, because when the game first came out I rerolled a ton of times (uninstalled + reinstalled for initial orb summons) to get a takumi, and after a while didnt bother putting a name so left it default

Its your characters default name, like Mark in blazing blade, or Robin in awakening.

As the others have mentioned, it’s the default name for your Avatar. You’ll see a lot of Kiran’s and エクラ‘s (Ekura) from people who haven’t bothered to change the Nickname, either due to multiple accouts, lack of care, or preference for the name.

It’s the default name. I’m guessing that some players just don’t know what name to use.