I know Kenichi, Shibugaki, and Tamao. I was wondering how you pronounce Tamao.

Also I have seen wiki state Tenma first name only in Japanese, Nagamiya. When I saw that I was like "Wha?". I have seen it all in Japanese and don't remember that. Or is wiki just wrong?
I have also noticed you can spell Denko/Denkou either way. I did not know, I was confused at first seeing it spelled the other way and thought I was wrong.