how come we say suffix?

Good question. Etymologically postfix is a better word for what we do. A postfix is an affix that goes after the root, post fix, not under the root, sub fix. http://www.bartleby.com/61/63/S0866300.html

Without digging into the results too deeply, suffix scores 1.03kT and postfix 1.12kT. There seems to be a software program called Postfix that's skewing the results, but.