What's up with the name "Zerozaki Hitoshiki"? Inspired by this question asking about the Fire Sisters' boyfriends' ridiculous names, here's another question about the bizarre names that Nisio Isin assigns his characters.

I'm trying to find any hidden meanings in the name "Zerozaki Hitoshiki (零崎 人識)" that relate to his character or part in the story. This character is from the Zaregoto series. The character is a knife-wielding serial killer whom the narrator meets in the second novel and describes as his own mirror image. His name is so ridiculous that even other characters in the book find it ridiculous. I looked up the kanji and the first kanji can be read as "rei", which has a meaning related to "zero". The second kanji is the same kanji that appears in common spellings of the names "Yamazaki" and "Kanzaki". The rest of it just puzzles me. I'm wondering if there are more hidden meanings that relate in some way to his personality or his part in the story.
As @ʞɹɐzǝɹ mentions, the kanji 零 can be read as ぜろ ("zero") and has the meaning "null" or "cipher", as well as "overflow" (as in the word こぼれる). 崎 can be read as さき ("saki") which can become "zaki" under rendaku. It's the same kanji we see in common spellings of the names "Yamazaki" and "Kanzaki" (山崎 and 神崎). I believe this might be to make the word sound more like a real name, like adding Mc- or -son to English words ("Grumpy McSnarlson"). 

人識 ("Hitoshiki"), the character's given name, is written with the kanji for "person" (hito) and "know" (識) (also seen in the word shiru). Again, I believe the 識 character is just to make the name sound more like a name. The fact that he kills people may lend some significance to the 人 kanji.