It's a C segment car, that means it's around the same size a Focus, Golf or Corolla.
Ford used this naming convention for many of its Euro minivans.
There was a B-Max based on the Fiesta.
They also had the larger Galaxy based on the Mondeo/Fusion. There was a sportier "coupe" version of that called the S-Max, presumably because it's sporty. Either of those should've been the E-Max.