Dallas sits next to 4 phonetic neighbors — Wallace, Alice, and Callous 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"
"house of the afflicted"
"God is gracious"
"renowned in battle"
"hope and assurance"
"invented name: Jo + lene"
"lovable, deserving of love"
"of royal status, kingly lineage"
"firstborn daughter"
"beloved, wished-for child (from Hebrew Miriam via Mary)"
"ambergris, waxy substance"
"short form of Cleopatra: glory of the father"
"fairy, enchantment"
"noble, princess"
"middle of the plain"
"star, heavenly body"
"from the oak wood"
"goddess of flowers and spring"
"to be of worth, to be strong"
"descendant of Fionnlaoich (fair hero)"
"to breathe, to live"
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.