Rob Gronovius
I would hazard a guess that it was the name at first.
i agree, with an added comment.
Edsel was the name of a fictional car company marketed as though Ford had bought it, as they did with Mercury. On the other hand, Lincoln was an actual car company.
So when lined up against other marques (not models);
Ford- a legend of American capitalism.
Lincoln- named after a President.
Mercury- a God.
Then there's;
Chevrolet- a racing car driver.
Buick- like Lincoln an actual independent company that GM acquired.
Chrysler- another famous industrialist.
Pontiac- an Indian chief and a city.
Dodge- an actual car company.
Plymouth- the badge even had a ship.
And on the AMC side;
Hudson- an actual car company.
Then there's- Edsel. Named after the son of a wealthy guy who ran his father's company when Henry was forced to leave; successfully but not visibly.
Bill