I think you can do the same sort of “Who were they before” with quite a few teams.
From memory.
Ferrari – always Ferrari, but they started out running Alpha Romeos
McLaren – always McLaren, but multiple changes of ownership.
Williams – always Williams, first change of ownership last year
Haas – always Haas
Mercedes – originally Tyrrell, then BAR, then Honda, then Brawn, then Merc. Won championships as Tyrrell, Brawn, and Mercedes.
Red Bull – originally Stewart, then Jaguar, then Red Bull.
Renault – originally Toleman, then Benneton, then Renault, then Lotus, now Renault again.
Aston Martin – already done
Alpha Tauri – originally Minardi, then Torro Rosso, now Alpha Tauri
Alpha Romeo – originally Sauber, then BMW, then Sauber again, now Alpha Romeo