There are more details of the study through this link but the short version is that cats probably don’t “know” the sounds coming from our mouths are their name, it’s an association they’re making of us wanting their attention. Dogs may “know” their names because they’re obedient, pack creatures.
In the case of our three current cats (and probably the other three who crossed the Rainbow Bridge), if they “knew” their names, they would probably know them as Dammit! (Nemo), Stopthat! (Isis) and Ughbuttinmyface! (Kuroneko).