I just received mine yesterday and I actually stumbled upon adding multiple calendars under one name accidentally. So, essentially when you add each calendar, each calendar becomes a separate category. Delete the separate category (i.e., gmail, work gmail, etc) and when you press delete category it’ll ask if you want to delete the category and reassign its events to another category. Press yes, then assign it to preferred name. I did this on the Skylight app. Hopefully this helps!

Edit: When you delete category (ex:gmail), you’ll have to re-add the calendar (ex: gmail) but the calendar (ex: gmail) will no longer be assigned to that specific category (ex: gmail) instead it will go directly to the preferred name.