Atom sits next to 4 phonetic neighbors — Adam, Atom, and Ethan are the closest matches by sound. Most share Atom's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"indivisible, uncuttable"
"enduring, steadfast"
"cloud"
"sun and sea (Hawaiian compound)"
"archway, structural arch"
"God has helped"
"fortune, chance"
"foreigner, one from abroad"
"steep rock face by a crossing"
"protector of mankind"
"herder of sheep, shepherd"
"harmony, one"
"queen of the gods"
"clever, astute"
"warlike, fighter (from Thracius)"
"from the fortified town"
"strong, healthy"
"surname used as given name"
"narrow strait (via Kyle)"
"modern American coinage (rhyming name family)"
"island"
Similar sound: These names share phonetic patterns with Atom — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Atom.
Rhythm: Atom is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.