While this is currently not available, starting MATLAB R2018a, the Name attribute on a TestSuite node is populated with the name of the test class (or the test function if you are running a function-based test) in the Junit-XML report produced by the MATLAB XMLPlugin, with the child TestCase nodes holding the information about the test points within the test class or function.
But I am still curious to know more details about what you are trying to do.
Are you looking to distinguish tests written in MATLAB from the tests written in other languages while viewing the Jenkins report using the Name as an identifier?
If there was a way to specify the Name for a TestSuite node in the XML report, would you expect it to be the same across all TestSuite nodes?
Would you expect the Name to persist across multiple test runs, with the same or a different suite?