"so even in the esxi host web client name all of my servers with lower cases?"
No, I'm talking about the vCSA and not others.
"do you know if there is a gen8 installation of esxi/ if so do you have link? or is there a standard install that I could use?"
You can get vendor-customized ISOs for ESXi from either the vSphere download page in your My VMware account or, in this case, from HPE downloads.