There is an item in Preferences under Editing named “Parts get track names” which if ticked will name all events in that track based on the name of the track itself. Play with it and see if you like it ticked or unticked.
However, you also have the option to rename any event independently.
you can also when you type the track name before you hit enter, hold the “CTR” key in and it will change the name (event/part) to the name you entered
I prefer this method cause when you move events around to different tracks it changes the name of that event/part to the track you moved it to when you tick in the prefs under editing “parts get tracks names”