This is interesting. Some enterprising fans have discovered that Meghan & Harry have been low-key somewhat generically posting on Instagram under their new nonprofit name since February. They must have planned to announce their nonprofit and their new Instagram handle after March 31, but the new world health situation changed their plans.
https://www.instagram.com/archewell.global/
Now that the name of their new nonprofit was leaked and they made the decision to confirm before a bunch of tabloids weighed in, it was easy enough for curious fans to do a search on Instagram under 'Archewell.' There's also a question now of how the first part of the name is pronunced: the Greek 'Arche' as in archetype; 'Arch' as in Archbishop; or 'Archie' same pronunciation as their son's name, but without the 'i' spelling?
ETA:
Some people thought they would go with 'Sussex Global,' but it's apparently 'Archewell Global.' The new trademark logo is cool. LOL! Two feathers and a crown have some ancient Egyptian, divine, and ancient to modern day royal symbolism. So they get the 'royal' connection in there still without actually using the word, 'royal.'

In general, the ancient royal significance in regard to feathers is borrowed from the ancient and divine meanings of feathers and of birds. Yellow or gold feathers signify the sun, and Archie was born on May 6th at about the time of sunrise in London (his place of birth).
Plus, Meghan's coat of arms features three feathers symbolizing quills that were in former times used for writing/ communication, which in part references her acting career and her aptitude for writing.
en.wikipedia.org
What do all of these coats of arms mean?
metro.co.uk
The time of the royal baby's birth indicates that he is a "very powerful individual."
www.townandcountrymag.com
Feather symbolism refers to the art of understanding the meaning of angel’s feathers, to embrace the Divine protection and guidance that the Angels offer.
www.guardian-angel-reading.com
Comprehensive article - the meaning of finding feathers, feather signs & synchronicity, feather spiritual meanings, feather color meanings, types of bird feather meanings, bird & wing symbology, ancient meaning of feathers, interpreting & intuiti
www.nataliakuna.com
ETA:

OTOH, despite that particular account reading like the real thing, I noticed there are about 49 Instagram accounts (and counting) with some form of 'Archewell' foundation, organization, charity, etc., in the name. Some accounts even use M&H's signature logo with a crown and their combined initials against a blue background. So the name 'Archewell' must have leaked quite awhile ago when M&H first filed trademarks. If they do start another Instagram, there's no certainty they would decide to use the name of their foundation, or nonprofit. Oh well, the feathers symbolism, history and meanings is a fascinating topic.