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"
"pilgrim to Rome; from Rome"
"son of Gray"
"son of Brice, the speckled one"
"God will increase, he will add"
"God is gracious"
"one who bails, deliverer"
"asked for, prayed for"
"God is salvation, the Lord saves"
"lion"
"descendant of the ruler of the home"
"Lord"
"holder of the heel"
"at the ford"
"from the hay enclosure"
"fortunate, good"
"modern American invention"
"dove"
"barrel maker"
"hollow (place)"
"handsome"
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.