Brisen sits next to 4 phonetic neighbors — Bryson, Braysen, and Brieson are the closest matches by sound. Most share Brisen's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
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Similar sound: These names share phonetic patterns with Brisen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Irish/Celtic origins, giving them the same cultural heritage as Brisen.
Rhythm: Brisen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.