Voldemort se refere a si mesmo na terceira pessoa (nunca é um bom sinal, evite pessoas que o fazem) como 'Lord Voldemort':
Harry’s voice was high, clear, and cold, his wand held in front of him by a long-fingered white hand. The man at whom he was pointing was suspended upside down in midair... “I have it not, I have it no more! It was, many years ago, stolen from me!” “Do not lie to Lord Voldemort, Gregorovitch. He knows. . . . He always knows.” ~Harry Potter and the Deathly Hallows - The Thief
Seus seguidores, simpatizantes (e Snape) se referem a ele como 'o Lorde das Trevas' quando falam sobre ele e em sua presença eles se dirigem a ele como 'Meu Senhor'
“My Lord,” Yaxley went on, “Dawlish believes an entire party of Aurors will be used to transfer the boy —”~Harry Potter and the Deathly Hallows - The Dark Lord Ascending
Belatriz é quem se opõe quando Harry o chama simplesmente de 'Voldemort':
“Shut your mouth!” Bellatrix shrieked. “You dare speak his name with your unworthy lips, you dare besmirch it with your half-blood’s tongue, you dare—” ~Order of the Phoenix, chapter 35 -Beyond the Veil
As pessoas que lutaram contra ele, como Dumbledore e Harry, chamam-no de "Tom" ou "Riddle" (que ele odeia como este nome representa seu pai trouxa) e "Voldemort" quando ele não está presente:
“So, Tom . . . to what do I owe the pleasure?” Voldemort did not answer at once, but merely sipped his wine. “They do not call me ‘Tom’ anymore,” he said. “These days, I am known as —” “I know what you are known as,” said Dumbledore, smiling pleasantly. “But to me, I’m afraid, you will always be Tom Riddle. ~Harry Potter and the Half-Blood Prince- Lord Voldemort's Request
e Harry na batalha final:
I’ve done what my mother did. They’re protected from you. Haven’t you noticed how none of the spells you put on them are binding? You can’t torture them. You can’t touch them. You don’t learn from your mistakes, Riddle, do you?” “You dare —” “Yes, I dare,” said Harry. “I know things you don’t know, Tom Riddle. I know lots of important things that you don’t. Want to hear some, before you make another big mistake? ~Harry Potter and the Deathly Hallows -The Flaw in the Plan
Outros membros da Ordem também o chamam de Voldemort. Todos os demais o chamam de "Você-Sabe-Quem" ou "Aquele-Que-Não-Deve-Ser-Nomeado". Como as únicas pessoas ousaram chamá-lo de 'Voldemort' foram aqueles que o combateram, ele usou um feitiço para rastrear as pessoas com ele:
“but the name’s been jinxed, Harry, that’s how they track people! Using his name breaks protective enchantments, it causes some kind of magical disturbance — it’s how they found us in Tottenham Court Road!” “Because we used his name?” “Exactly! You’ve got to give them credit, it makes sense. It was only people who were serious about standing up to him, like Dumbledore, who ever dared use it. Now they’ve put a Taboo on it, anyone who says it is trackable — quick-and-easy way to find Order members! They nearly got Kingsley — ~Harry Potter and the Deathly Hallows - Xenophilius Lovegood
Mas isso não significa que ele oponha as pessoas ao nome "Voldemort". Ele não parece ter um problema com isso:
How did you escape with nothing but a scar, while Lord Voldemort’s powers were destroyed?” There was an odd red gleam in his hungry eyes now. “Why do you care how I escaped?” said Harry slowly. “Voldemort was after your time. . . .” “Voldemort,” said Riddle softly, “ is my past, present, and future, Harry Potter. . . .” ~Harry Potter and the Chamber of Secrets - The Heir of Slytherin
Eu não sou um grande fã da Criança Amaldiçoada, mas a cena a que você está se referindo acontece em uma sociedade distópica, onde Voldemort venceu. As pessoas deveriam idolatrá-lo, então 'você-sabe-quem' está fora de questão. Não há mais conflito entre as trevas e a luz, então não há razão para chamá-lo de 'Lorde das Trevas'.
'Para Voldemort e Valor' é uma aliteração cativante, então provavelmente o cara que Voldemort encarregou do PR surgiu e isso lembra tanto o culto da personalidade de Mao, Stalin e Kim Il sung quanto a saudação no Terceiro Mundo. Reich, por isso parece convincente e adequado considerando a situação.