Lewis sits next to 4 phonetic neighbors — Louis, Luis, and Lois are the closest matches by sound. Most share Lewis's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"famous warrior"
"Frenchman"
"administrator of justice"
"hillside dweller"
"statement of belief, system of faith"
"rich friend, prosperous friend"
"rye-field dweller"
"birth, nativity"
"black gemstone"
"declared innocent, acquitted"
"kingly, of royal blood"
"God has given"
"the great river"
"God will raise up"
"strong, healthy"
"sorrowful (folk etymology via French)"
"sun, like the sun"
"white/pale (from Cas people)"
"from Scotland, a Scotsman"
"slender"
"good place"
Similar sound: These names share phonetic patterns with Lewis — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic via French origins, giving them the same cultural heritage as Lewis.
Rhythm: Lewis is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.