No one, he made up this name himself. His real name is Tom Marvolo Riddle; he rearranged the letters of his name to form the phrase "I am Lord Voldemort", as can be witnessed in Harry Potter 2.
It should be noted that Voldemort comes from the French "vol de la mort," meaning "flight of death."
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Lord Voldemort. Because of the terror he spread in the past, most wizards and witches - with the notable exception of Albus Dumbledore, and Harry Potter - are afraid to pronounce his name.
Lord Voldemort (translating roughly to violence of death in French) also, it should be known to the reader that said name is an anagram of the name of another character: Tom Marvolo Riddle - I am Lord Voldemort
Kingsley shacklebolt is named temporary minister for magic after voldemort is killed.
Yes, a large snake named Nagini. Arguably not a pet as the snake turns out to be a horcrux.
If you're talking about Voldemort, his real name is Tom Marvolo Riddle. He's called Lord Voldemort because his father was a muggle and also named Tom Riddle and he didn't want to have the same name as a muggle. Also, in the Chamber of Secrets it's revealed that Tom Marvolo Riddle is an anagram with I am Lord Voldemort.