Buffy sits next to 4 phonetic neighbors — Muffy, Biffy, and Betty are the closest matches by sound. Most share Buffy's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"God is my oath"
"valley; place"
"Variant of Sherman; from the shearing settlement"
"broom-covered hill, beacon hill"
"free person, strong one (via Carla/Carl)"
"eagle rule, power"
"Possibly a variant of Teresa/Therese, meaning to reap or harvest"
"American creative invention"
"Gaelic form of Jane/Jean"
"of the alder tree"
"follower of Christ"
"pure, clear"
"honoring God, one who honors God"
"fertile plain"
"bright fame"
"faith"
"Of the sea, warrior; defender of the sea"
Similar sound: These names share phonetic patterns with Buffy — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew via Elizabeth origins, giving them the same cultural heritage as Buffy.
Rhythm: Buffy is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.