Should someone avoid being a witness such as at a wedding, if there is a question about their father’s hebrew name?
What happens if a question about the father’s name arises after they were already a witness?
You do not have to avoid being a witness. It is part of the job of the mesader kedushin, to verify how to spell the names of all of those written in the kesubah. If you know that there is a question, you should bring it up with him, so he can verify things in a timely, organized manner.