Bret sits next to 4 phonetic neighbors — Brett, Brad, and Brent are the closest matches by sound. Most share Bret's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"a Breton, from Brittany"
"dear friend"
"to hang, weigh, measure"
"eager for battle"
"healer"
"shearer of woolen cloth, cloth cutter"
"warrior, slayer"
"half-wise; simple wisdom (ironic Old English)"
"from the settlement near St. Botolph"
"God sows, God scatters seed"
"glory of the homeland"
"lawful, upright"
"strong, enduring"
"mind, intellect, spirit"
"dark settlement"
"army, nobleman"
"God is gracious (via John)"
"supplanter (James element)"
"nobody, no one"
"one who makes verses"
Similar sound: These names share phonetic patterns with Bret — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Celtic/French origins, giving them the same cultural heritage as Bret.
Rhythm: Bret is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.