I'm against using terms that are already used in other cities. We need a name, that when you hear it, you instantly know it's Toronto's Japanese area. Forget about terms like Japantown, San Francisco already has dibs to that name. We need something unique and different, for all our new districts. We need to stop copying everyone else and develop our own unique names, districts and everything else, instead of just taking the easy way out.
By the way, Regent Park is mainly Ethiopian/Somalian/Muslim now and not so much African-Canadian.