Git - Rename multiple branches

Here we have a git repo which has multiple branches which start with the same prefix just like this:

pfx.branchName1  
pfx.branchName2  
pfx.branchName3  
...

So the question is how to quickly remove all the prefixes ("pfx.") from all the branches and get something like this:

branchName1  
branchName2  
branchName3  
...