I don't know about Demon Child. But the name Raksha means Demon.
Summoning a demon requires correct and complete knowledge of the "true" name of the demon you intend to summon.
Demon Dan's birth name is Daniel Blackner.
One demon is often refered to as 'Satan'.
Blue Demon's birth name is Alejandro Muoz Moreno.
I found more than one reference to the name Agramon as the Demon of Fear.
A demon Acala is just an ordinary myth. Acala is or was actually the devils name. See the demon word is just another name for devil or spirit.
No
Asmodeus is the demon of wrath. The name is taken from the Zoroastrian faith, where Asmodeus was the king of demons.
The girl's name in "The Demon Headmaster" is Dinah Glass. She is one of the main characters in the series and plays a significant role in thwarting the plans of the Demon Headmaster.
no
Balthazar.