Corrected entry: Harry learns the owner of the diary from the writing on the back and it 'introducing itself'. It's plausible that the name doesn't alarm him; he grew up in the Muggle world. It does imply however, that since learning of Voldemort in his first year, he has not attempted to find out Voldemort's real name/identity. Similarly, Ginny engaged with it, even though she grew up in the Wizarding world and presumably would know the name. Or she never looked at the back or 'introduced herself' to the book.
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Correction: Voldemort's real name is not common knowledge in the wizarding world. Even saying the name "Voldemort" is taboo among wizardkind so it is hardly surprising that they didn't spend much time looking for his identity. As Dumbledore explains in chapter eighteen of the novel: "Very few people know that Lord Voldemort was once called Tom Riddle. I taught him myself, fifty years ago, at Hogwarts. He disappeared after leaving the school... traveled far and wide... sank so deeply into the Dark Arts, consorted with the very worst of our kind, underwent so many dangerous, magical transformations, that when he resurfaced as Lord Voldemort, he was barely recognizable. Hardly anyone connected Lord Voldemort with the clever, handsome boy who was once Head Boy here."
Kylantha