The question is whether the neighborhood name comes from Fairmount Hill, from the colonial Fairmont estate, or from Fairmount street that runs through the area.

Fairmount is a name for the hill that the Art Museum is on- I think Fairmont was the name of a colonial estate ON the hill- It's like
Pittsburg_ PittsburgH people change back and forth-

Farimount Hill it was called Morris Hill around the time that British troops burned about 20 colonial farms in that part of the city to established a clear fire perimeter in 1777. The estate may have been called Fairmont estate after it was rebuilt.

Oddly, the NEIGHBORHOOD around there was intially called Cherry Hill, after a colonial era cherry orchard- the Eastern State Pennitentiary is now located on the hill where the cherry trees were.

Hal