Actually if I say the truth, yes its posible by changing it via DB user table
But remember we are not recommended to doing it for any reason because ite main user created by default to manage admin layer.
So what do you do then…
This this the way you can handle. If your organization not allowing such name , just keep that user for emagancy use ( no one will use this user and you can put admin user credentials in your safe place liken organization safe)
And if your are using good ISO practices yes thats same you have to have it on your safe.
Create another users as you want in orchestrator with any one and assign administrator role permission to accordingly. So that user can work as same as admin user.
So you can keep your admin user as idel (no one need to use it)
But remember some sort of senarios its required admin user for function of admin so if its required you can use admin user , if not keep it as same but no need to use