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"
"dark, full; complete darkness"
"the eighth (via Octavius root)"
"of Tyre, the ancient city"
"Peace and relief from sorrow"
"to flow down, descend"
"holy settlement"
"heroic, on a grand scale"
"modern invented name (Dre + lyn blend)"
"rocky land, land of rock"
"Maker of barrels and casks"
"little warrior"
"Beorhtsige's town"
"western meadow"
"fictional Fire Lord, invented name"
"modern American creative formation"
"creative elaboration of Quinton/Quentin"
"crowned with laurel, laurel bearer"
"noble friend"
"tile maker, tiler"
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.