Just 1 Marriott, all 3 are merged. Points all combine into Marriott rewards now (though if you had separate SPG and Marriott rewards accounts you need to merge them). Some of the legacy names have been kept up until now (SPG, Marriott, RC), but next month the rewards program will be combined under 1 name, Bonvoy. There will be multiple Marriott Bonvoy credit cards. The Marriott Chase cards will become Bonvoy Chase cards; the SPG Amex cards will become Bonvoy Amex cards.

More on the Bonvoy credit card thread: https://www.flyertalk.com/forum/marr...dit-cards.html