Carsen sits next to 3 phonetic neighbors — Carson, Karsen, and Larson are the closest matches by sound. Most share Carsen's Scottish cluster, so the rhythm and vowel shape carry across the list.
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"son of marsh dwellers"
"flowing water, river"
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Similar sound: These names share phonetic patterns with Carsen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scottish/Old Norse origins, giving them the same cultural heritage as Carsen.
Rhythm: Carsen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.