Nezuko sits next to 4 phonetic neighbors — Neko, Nezuko, and Nezumi are the closest matches by sound. Most share Nezuko's Japanese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"root child, sound child"
"only one, unique"
"canary bird"
"self-arising"
"king of the underworld (Japanese mythology)"
"twin"
"knowledge obtained by investigation"
"good art, excellent performance"
"honor, light"
Similar sound: These names share phonetic patterns with Nezuko — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Japanese origins, giving them the same cultural heritage as Nezuko.
Rhythm: Nezuko is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.