Knox sits next to 3 phonetic neighbors — Fox, Cox, and Knocks are the closest matches by sound. Most share Knox's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"round hill"
"holy, sacred one"
"consecrated; worthy of reverence"
"my God is the Lord"
"strong, mighty"
"from the castle, place near the ditch"
"conqueror, winner"
"high mountain"
"who is like God?"
"son of Nicholas (via Cole)"
"of the forest"
"cask maker, craftsman"
"God will raise up"
"to prevail, to win"
"light of heaven"
"steadfast defender"
"son of Jack"
"rye-field dweller"
"resolute protector, strong-willed guardian"
"he who descends, descent"
Similar sound: These names share phonetic patterns with Knox — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English/Scottish origins, giving them the same cultural heritage as Knox.
Rhythm: Knox is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.