Mills sits next to 3 phonetic neighbors — Miles, Ellis, and Will are the closest matches by sound. Most share Mills's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"dweller by the mills, mill worker"
"servant of a noble, warrior retainer"
"pure (via Katharina in Norwegian use)"
"modern American name"
"handsome, beautiful"
"divine peace, God's peace"
"my inheritance"
"second of twins"
"my vision, my sight"
"land of oaks"
"greatest, son of Max"
"little gift of God"
"nickname for Charles"
"the shining one"
"from Laurentum, laurel"
"slender, lean, narrow"
"enduring, steadfast"
"son of Rhys, son of the ardent one"
"lord of the sea"
"rescuer, redeemer"
"great tide, sea flow"
Similar sound: These names share phonetic patterns with Mills — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Mills.
Rhythm: Mills is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.