| Subject | English | Welsh |
| comp., MS | user name | enw defnyddiwr (A unique name that identifies a user account to Windows. An account's user name must be unique among the other group names and user names within its own domain or workgroup) |
| comp., MS | Windows user name | enw defnyddiwr Windows (A unique name that identifies a user account to Windows. An account's user name must be unique among the other group names and user names within its own domain or workgroup) |