Knoxx sits next to 3 phonetic neighbors — Knox, Knocks, and Nox are the closest matches by sound. Most share Knoxx's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"round hill, hillock"
"descendant of the hound of valor"
"divine power, God's rule"
"forefather"
"precious green stone"
"stoneworker, craftsman"
"highlands, uplands"
"tailor, one who cuts cloth"
"modern American invention combining Da- prefix with Marion"
"uniquely strong, one force"
"gift of God"
"hero, champion, semi-divine mortal"
"of the field, strong"
"deer meadow"
"the tree of enlightenment"
"descendant of the red one"
"wave"
"Aromatic herb, salvia"
"celestial body"
"victory; honor"
"battle"
Similar sound: These names share phonetic patterns with Knoxx — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scottish/Old English origins, giving them the same cultural heritage as Knoxx.
Rhythm: Knoxx is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.