Why is there a 'name' argument inside 'scale_x/y_continuous()' functions in ggplot, when already 'x/ylab()' functions exist?

I suppose the name argument in scale_x_continuous() and scale_y_continuous() functions in ggplot, only changes the axis labels, and so do the xlab() and ylab() functions.

So, what's the need of this argument in those functions?