Add category name to Families

Hi all, I’ve found this forum extremely helpful and I’m quite new to using dynamo

Having some trouble with a script I’m working on.
I would like to add a prefix of the company name and category to the family names.
Ideally I would like to do it too all the families but for now I’m working category by category.

I’ve gotten this far but it doesn’t work and I can’t figure out where I’m going wrong.

Please help

Thanks for the fast response.
Unfortunately it didn’t work
The watch list shows no change

And the NBBJ_ needs " " around it to make it a string.

But please stop with the company prefixes in content, it is completely redundant and a huge non-value add.