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"
"lord, master"
"fair-haired hero; white warrior"
"twin, double"
"son of Jack"
"lion-bold; brave as a lion"
"raven hill"
"red king, famous ruler"
"gift of God"
"rich protector"
"greatest"
"Supplanter; one who follows at the heel"
"messenger of God"
"rich friend, prosperous friend"
"occupational name for an archer or bowman"
"lion"
"God is gracious"
"Yahweh is deliverance"
"modern American invented name"
"one who lives near a brook"
"son of Kay"
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.