Hi,
If all your variants name are the same than your main product name, then you should remove the name in the variants so that they take automatically the name of the main product only.
That way, when you want to change the name of the product and its variants in the future, you just have to change the name of the main product.
You can also do the opposite and only fill in the name of the variants and not the name of the main product.
If you want to keep both and change the way it displays, it still possible, but it will require you to edit each and every email and view file where they are displayed to change the code so I don't recommend doing that.
If you want to remove the name of the main products or variants in one fell swoop, I ould recommend to use a mass action:
www.hikashop.com/support/documentation/167-massaction-form.html