Dallas sits next to 4 phonetic neighbors — Dawson, Davis, and Dalton are the closest matches by sound. Most share Dallas's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"meadow dwelling, water meadow"
"frisky, energetic youth"
"high mountain"
"God is my judge (variant of Daniel)"
"messenger"
"truly brave, genuinely bold"
"rowan tree (mountain ash)"
"black gemstone; jet"
"from Santino (little saint)"
"first, chief"
"healer, to heal"
"bright fame"
"superlative of magnus (great)"
"from Dax, town settlement"
"park, game preserve"
"descendant of Ceallachán"
"battle (possible Irish Gaelic root)"
"little fire"
"descendant of Aodh (fire)"
"descendant of Bradán (salmon)"
Similar sound: These names share phonetic patterns with Dallas — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scottish Gaelic origins, giving them the same cultural heritage as Dallas.
Rhythm: Dallas is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.