Why did the farm's name change from Manor Farm to Animal Farm?

Manor
Farm is a name devised by humans. As such, it symbolizes the control they have over the farm and
over the lives of the animals who live there. Once the animals take control, however, the
ideology of Animalism is put into effect. Among other things, this means that the old name has
to go, along with all other signs of domination by the hated human enemy. According to
Animalism, humans are exploiters of animals. They must be overthrown and expelled from the farm
if the animals are to have freedom over their own lives. So, to symbolize the new order, the
name of the farm is changed to . The farm belongs to the animals now. It is
their farm, not the humans'.

Equally symbolic is the
fact that the name of the farm changes back to Manor Farm when the pigs
learn to walk upright and are almost indistinguishable from humans.