Books 1-5 was professor Snape, book 6-7 was Horace Slughorn.
Catherine Masters's birth name is Catherine Michelle Masters.
Howard Masters's birth name is Howard C. Masters.
Norm Masters's birth name is Norman Donald Masters.
Tess Masters's birth name is Terriann Lynne Masters.
His masters name is Cross marian.
Jonny Masters's birth name is Jonathan Philip Jacob Isaac Masters.
Her name is Gretel
Severus Snape
mona
A possible name would be Alchemist.
The name of Dr William Masters first wife was Elizabeth Ellis Masters.
Lalanya Masters's birth name is Lalanya Abner.