No problem at all, in fact I do it all the time. It's a waste of my time and energy writing every name out - you know who you're talking about, right?
That being said, every once in a while I have an emotional need to see someone's name in full so I can really curse them out (we have a community member in my condo who is so foul to the people trying to keep this place running that I write her name out in full just so I can write, quite legibly, "G**d*** f***ing L**** W*** is at it AGAIN F*** Me to hell and back" which gives me a great deal of pleasure.)
This is not journaling in the sense of keeping a journal or a diary. It is literally writing shit down and then destroying it immediately. No one should be able to read it. The majority of my writing is completely illegible.
The only important goal in emotional writing is complete honesty, which requires getting every random thought out of your head and onto the paper, and not allowing your fearful brain to edit what you write, or to hold anything back, even though your brain will try to do both those things.