Just add "GF" to the dictionary. When you type it, you'll probably see something like this in the predictive text area:

gf | Greg | ....

Greg is probably orange, because that's what it's going to replace with. But, your original word is always shown on the left. If you press on it, and hold, it will save it to the dictionary so that it will work for you in the future.

If you go into settings, there is also a place in there somewhere that you can add and remove words.

I had to do this for one of my son's names... worked like a charm.

 

@ thajack

Where in settings is it possible to edit the dictionary?


I would like to remove some words added in error.

 

It's in settings, in the Language & Keyboard section. The User Dictionary is listed in there.