Brit sits next to 4 phonetic neighbors — Britt, Brett, and Brad are the closest matches by sound. Most share Brit's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from Britain, Briton"
"to wait, to stay"
"Prosperous spear; rich with fortune. A dialectal and Anglicized var..."
"rallying banner"
"golden, yellow-haired"
"rocky hill, outcropping"
"openness, frankness, sincerity"
"from Darney (place name)"
"beloved, dear"
"western meadow"
"one who crosses; toll collector at a crossing"
Similar sound: These names share phonetic patterns with Brit — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Celtic origins, giving them the same cultural heritage as Brit.
Rhythm: Brit is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.