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"
"sea, ocean"
"bane, destruction (war god)"
"one who lives near a lane"
"brave as a lion"
"divine"
"battle, companion"
"battle (possible Irish Gaelic root)"
"coal town, dark settlement"
"descendant of Rían (little king)"
"Lord"
"bear strength, brave as a bear"
"bright fame"
"Christmas, born on Christmas"
"dark red, crimson"
"he who descends, descent"
"park, game preserve"
"divine smith, master craftsman"
"son of Emery"
"God of the people"
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.