Order by on an alphanumerical column

Question

I have a column that has strings of the following type:
Miller 10
Allen 20
King 10
....
Jones 100

I try to sort the column based on the numerical part of the data.
I tried the following:

SELECT * FROM the_table ORDER BY CAST(RIGHT(data,2) AS UNSIGNED);

But this does not work. It places Jones 100 as the first entry etc.

What am I doing wrong?