If you really want to get rid of the name and want the work done right I would suggest a luthier. Check the above link for Frank Ford. He usually works on stringed insturments but the prosess is the same. Don't know if he would work on an accordion.
First of all, you can always order the accordion with no name on it. Anytime Dad has extra time, he makes an extra accordion or two to sell as-is in his shop. Those don't have names. Anyone can ask not to have his name on it.
Second, yes, a luthier would be a great fix. If you want to do it yourself, however, how about filling it in (it's engraved) with a wood putty, sanding it down, and matching the finish? That's a little scary, though. You could also bring it to Dad and ask him to change out that plate.
I bought one of those "extra" accordions in april of 2005. Key of C, just what I was looking for. A small brass nameplate or silver whatever you like works great to cover an existing name you wish to get rid of. That what I did to "little red" ACADIAN, the 9 button that california cajun orchestra used on one of their albums.