Potentially any name under the FCA umbrella, or the Renault-Nissan-Mitsubishi Alliance could be worn on an F1 team in the future. Is it likely? I don't think so as Alfa Romeo has just entered this year - with their racing image and F1 history I think they are best suited (from a marketing and investor's point of view).
For information here are the list of brands the proposed merger
could chose from:
FCA (controlled by Exor Investments)
Abarth, Alfa Romeo, Chrysler, Dodge, Fiat, Jeep, Lancia, Maserati, and Ram Trucks
(Ferrari was separated from FCA in 2016 but remains an Exor investment)
Renualt-Nissan-Mitsubishi
Renault, Nissan, Mitsubishi, Infiniti, Renault Samsung, Dacia, Alpine, Datsun, Venucia and Lada
I'd pay to see a Lada Racing F1 team...