Nyx sits next to 3 phonetic neighbors — Nicks, Nix, and Lynx are the closest matches by sound. Most share Nyx's Greek-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"night, darkness"
"noble, exalted, high"
"pure, beloved"
"ruler of elves (Avery root)"
"holder of the heel"
"creative respelling of Germaine (warm brotherly love)"
"rival, eager"
"honor, fame"
"lily flower"
"whole warrior"
"my God is an oath"
"highly valued gift"
"diminutive of Ivan/John"
"wren, small bird"
"speckled, freckled"
"stone worker"
"feminine form of Charles"
"dark one, dark-haired"
"gift of God"
"thunder"
"saw, serrated edge"
Similar sound: These names share phonetic patterns with Nyx — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Nyx.
Rhythm: Nyx is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.