Boston sits next to 5 phonetic neighbors — Austin, Austen, and Preston are the closest matches by sound. Most share Boston's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"Botolph's stone, settlement by the forest"
"descendant of Lorcán"
"other, foreign"
"beautiful, all (Ella) + rose flower (Rose)"
"red-haired, reddish-brown"
"woodland clearing, meadow"
"paradise, spiritual aspiration"
"beloved beauty"
"god's door, entrance to God"
"wished-for child of grace"
"swift and true"
"noble, bright"
"of noble kind"
"short form of Aurora (dawn)"
"victory of the people"
"love, beloved"
"beloved"
"Christian woman"
"brilliant, glowing"
"feminine of Justin"
"courageous, bold"
Similar sound: These names share phonetic patterns with Boston — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Boston.
Rhythm: Boston is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.