I don't know any singer from the Coptic ages

nor even king (because during the Coptic ages Egypt was conquered by Greek then Roman then Arab)
Do you think this website will accept Saint name , Angle name or such ?

It could be a modern person with the name written in Coptic. A small affinity to the Coptic language would be good to have.
I believe you would want to add a name like Avva Shenouda. That would be perfectly acceptable as well.