Brittany sits next to 4 phonetic neighbors — Britney, Brittney, and Britt are the closest matches by sound. Most share Brittany's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from Brittany, land of the Britons"
"moonlit, bright moon"
"red-haired, ruddy complexion"
"strong wind"
"fire of God, God is my light"
"wealthy protector"
"raven"
"modern American compound name"
"beloved friend, gentle one"
"name of the sacred river in Arcadia"
"fair warrior, fair hero"
"God has remembered"
"strong-willed warrior"
"victory"
"little branch, tender bough"
"God is gracious (via Scandinavian John-family)"
"invented name (no traditional meaning)"
"son of Lars"
"modern invented name"
"who is like God"
"Craftsman; skilled tradesperson"
Similar sound: These names share phonetic patterns with Brittany — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Brittany.
Rhythm: Brittany is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.