how can i create operating system with my name

If you're starting from scratch, by the time you've completed the creation of your system you'll already be so old, you won't remember your own name!

If you're talking about an existing OS like Windows, which flavour of Windows do you have in mind?

Where exactly are you thinking of putting your name?

right click 'my computer', click 'properties', click 'computer name' tab, click 'change', rename the computer

you have to have admin rights to do this.

If you mean change the owner name, then load Regedit program. Then expand HKEY_Local_Machine, Software, Microsoft, Windows NT, CurrentVersion. Then double click on RegisteredOwner and change the name. You can also change the RegisteredOrganisation.

Also, you can create your own account, via Control Panel, User Accounts.