Good day everyone, I just want to get people's idea on this issue, especially those who had the same experience.

My middle name I have been using since secondary wasn't satisfied by me because it has no meaning, but I am still using it now on my documents in other to avoid causing issues in the university, now I have graduated and I wish to change the name officially.
Please am I taking the right step?
And what of the school and NYSC certificate which carries the formal name?