Brandon sits next to 5 phonetic neighbors — Brandy, Brendan, and Brenna are the closest matches by sound. Most share Brandon's Old English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"broom-covered hill, beacon hill"
"wise counsel, gentle (ewe)"
"light, famous"
"nickname, playful diminutive"
"pure, clear"
"of the alder tree"
"supplanter"
"fairy"
"Gaelic form of Jane/Jean"
"shining renown"
"pure"
"Possibly a variant of Teresa/Therese, meaning to reap or harvest"
"honoring God, one who honors God"
"Variant of Sherman; from the shearing settlement"
"messenger of God; angel"
"free person, strong one (via Carla/Carl)"
Similar sound: These names share phonetic patterns with Brandon — 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 Brandon.
Rhythm: Brandon is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.