Killua is a Japanese anime-associated coined name, created more for style and sound than traditional etymology.
Killua emerged from the creative imagination of Japanese manga artist Yoshihiro Togashi, who introduced the character Killua Zoldyck in the Hunter x Hunter series beginning in 1998. The name does not derive from any established linguistic tradition but instead carries the phonetic weight of a fictional world — its sharp consonants and trailing vowels giving it a simultaneously elegant and dangerous quality that suits its bearer, an extraordinarily gifted assassin-turned-hero who becomes the series' moral and emotional center. Togashi's genius lay in creating a character whose name sounds almost like a warped echo of "kill," yet whose arc is entirely about choosing friendship and humanity over a life of violence.
Within the global anime and manga fan community, Killua Zoldyck has become one of the most beloved characters in the medium's history, celebrated for his complexity — his white hair, his lightning-based abilities, and above all his profound bond with the protagonist Gon. The friendship at the heart of Hunter x Hunter has been analyzed as one of anime's most emotionally resonant relationships, which has deepened the cultural attachment to Killua's name specifically. Cosplay, fan art, and online communities have kept the character's presence vivid well beyond the manga's publication gaps.
Parents and individuals who choose Killua as a name today are almost exclusively paying tribute to this fictional legacy — it is a fandom name in the fullest sense, carrying a rich associative world within it. Like Hermione or Katniss, it represents a new category of given name: one whose entire meaning is a character rather than a word, and whose bearers share membership in a community of cultural recognition.