This is a generalized way in which you do not have to remember the exact location of the variable:
# df = dataframe # old.var.name = The name you don't like anymore # new.var.name = The name you want to get names(df)[names(df) == 'old.var.name'] <- 'new.var.name'
This code pretty much does the following:
names(df)looks into all the names in the
[names(df) == old.var.name]extracts the variable name you want to check
<- 'new.var.name'assigns the new variable name.