Apparently it had turned into a huge issue. That's really cool when everyone replies one's question. That’s why the forum stands for.
Now, regarding your question, of course not. You don't need to put any personal information in your certificate. You might put your phone number in case someone calls to verify if that information is true or not. You should put your name, the student’s name, level, and the time spend on it. That’s it!
Let me ask you something, have you ever heard about an Oxford book series for ESL teachers? It might be helpful for you.