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"
"of the Flavian family"
"openness, frankness, sincerity"
"rallying banner"
"western meadow"
"from the alder grove"
"rocky hill, outcropping"
"Prosperous spear; rich with fortune. A dialectal and Anglicized var..."
"beloved, dear"
"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.