Duke and duchess of Sussex, Harry and Meghan will no longer use “royal Highness” How does that work? Will they use last names?

SarahsSummer
Harry and Meghan are moving towards financial independence from the Royal family and will be spending 1/2 their time in Canada. I know Meghan has a last name, (Markle) but does Harry? Will he just be Harry like Cher or Madonna or Seal and everyone will know him or will it be like Prince (the musician) aka “the artist formerly known as Prince”? Or will he still go by Prince Harry?
Duke and duchess of Sussex, Harry and Meghan will no longer use “royal Highness” How does that work? Will they use last names?
Updates:
8 mo
This just in;

Queen Elizabeth had "banned" Prince Harry and Meghan Markle from using "Sussex Royal"—the brand they began establishing last year—now that they've stepped back from their roles as working royals.

www.townandcountrymag.com/.../
7 mo
It’s official “just Harry”
www.washingtonpost.com/.../
Duke and duchess of Sussex, Harry and Meghan will no longer use “royal Highness” How does that work? Will they use last names?
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