Mysql user where comes from

OS type and version ubuntu 18.04
Webmin version latest

I try to setup remote access to a mysql server. I think all steps are done but when I test the connection I get this error

Access denied for user ‘jv80’@‘’ (using password: YES)

The problem is the hostname, that come from when the vps was setup. I have changed bost hosts and hostname file years ago and cant find out where the host come from. Is there any other place it can come from?

Anders Yuran