My friend got married to be my best man, but what does it mean that he recorded a fake name for me at the hotel?

If he didn't mean it, it was because his words were unclear, which led to typos. That's understandable. If he did it on purpose and the other person is your best friend, it may be some kind of big joke. Maybe he found it interesting. Don't joke about the formal occasion of marriage. If you haven't thought about it, you will be angry. You have a problem, too. On the surface, you are married, but in fact, you are humiliated by getting married. But this possibility is very small. After all, friends who have been friends for decades should still have a clear personality. If he acts strangely, we can stay and talk to him, and the problem that can be solved will be solved. I don't want to pay unilaterally for the problem that I can't solve. At least this question makes me understand who you are.