Would you know what my name in Chinese is?

I need to know what the Chinese character for my last name would be; my last name being Tang.

I need it because I have to make a stamp of it (we use stamps instead of signatures here) and apparently I can't get anything verified or done with my mothers maiden name.

She doesn't know what Chinese character it was, but she said that it may have been a character that resembled 登.

Any help is welcome, and if no one knows what it is, I'm probably just going to make some character up. Haha.