The following characters have names starting with A:
Death eaters Avery Sr and Avery Jr are only referred to by their surnames.
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she is Emma Watson
Draco Malfoy
Please note that Harry Potter is a ficticious story, so talking about "real names" is a bit ... doubtful. The full name of this character is Hestia Jones.
There is no scientific name for Harry Potter.
The character's correct name is Cho (full name Cho Chang). Played by Katie Leung.