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"
"fair-haired hero; white warrior"
"little fire (via Aidan variant)"
"victory of the people"
"from Laurentum, crowned with laurel"
"God is gracious"
"elm grove"
"from the valley town"
"chosen savior"
"homestead by a stream"
"one who bails, deliverer"
"follower of Christ"
"son of Hendrik"
"dove"
"black gemstone"
"dark red, crimson"
"to tame, to subdue"
"handsome at birth"
"the blessed one"
"precious and brave"
"priest's town, priestly settlement"
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.