It is hard to say since the dream was so short. It sounds like Sehoy is a part of yourself that is making itself known to you for the first time. I'm guessing from your name that you are female. If so, he could be your
animus.
It would be great if he appeared in another dream, so you could learn more about him.
Maybe if you think about him before you got to bed, it will help.
You can try free associating with the name Sehoy. Write it down, then write down the words that the name brings to mind, then write down the words that those names bring to mind, and so on.