Brittney sits next to 4 phonetic neighbors — Britney, Brittany, and Brittani are the closest matches by sound. Most share Brittney's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from Brittany (French region)"
"temple, shrine"
"sea-bright"
"venerable, august"
"tune, melody"
"slender and fair"
"from the orange grove"
"saw, serrated edge"
"from Lassy, Norman place name"
"little lake"
"heavenly, of the sky, royal"
"Gaelic speaker"
"bearer of good news"
"fairy queen, princess"
"bright meadow (Z + leigh/leah)"
"pure, innocent"
"wry meadow"
"open sea, freedom"
"friend, ally"
"in truth, authentically"
"fragrant spice"
Similar sound: These names share phonetic patterns with Brittney — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have French origins, giving them the same cultural heritage as Brittney.
Rhythm: Brittney is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.