Harold Daye's birth name is Hal Tornroth.
Tom Marvolo Riddle."I am Lord Voldemort" is an anagram of "Tom Marvolo Riddle", which is Voldemort's name at birth.
He doesn't have a full name. In Harry Potter and the Chamber of Secrets, he wrote his full name,Tom Marvolo Riddle, with a wand. He then rearranged the letters to I am Lord Voldemort.
Tom Marvolo Riddle was a Slytherin Half-Blood who would later be known as Lord Voldemort. He didn't want to keep his muggle father's name (Riddle) (Muggle; non-magical person) so he fashioned a new name out of the letters in his birth name. Tom Marvolo Riddle is an anagram of I am Lord Voldemort.
Full name is Tom Marvolo Riddle; but he is usually known as Lord Voldemort.
Hal Baylor's birth name is Hal Brittan.
Rock Riddle's birth name is Steve Riddle.
Hal Havins's birth name is Hal Roth Havins.
Hal Lindes's birth name is Lindes, Hal Andrew.
Hal Rothman's birth name is Hal Karl Rothman.
Hal Kemp's birth name is James Hal Kemp.
Hal Frederick's birth name is Hal Christopher Frederick.
Hal Beckett's birth name is Foxton Beckett, Hal.
Hal Scharf's birth name is Hal Samuel Scharf.
Hal Needham's birth name is Hal Brett Needham.
Ashley Riddle's birth name is Ashley Abbigail Riddle.
Nelson Riddle's birth name is Nelson Smock Riddle Jr..