Karsen sits next to 5 phonetic neighbors — Carson, Carsen, and Larsen are the closest matches by sound. Most share Karsen's Old Norse/Scottish (via Carson)-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of Carr, son of the marsh dweller"
"little red-haired one"
"wild garlic island"
"powerful and brave"
"court musician, entertainer"
"tile-maker, tiler"
"son of the earth-man"
"resolute protector (if variant of Liam)"
"lime tree hill"
"battle, fighter"
"descent, gentle"
"from, of (noble German particle)"
"modern invented name, valley dweller (from -den suffix)"
"joined, attached"
"God is salvation"
"modern invented spelling"
"huckleberry berry plant"
"righteous, just"
"creative expansion of Mazie (pearl) + -on suffix"
"ruler of peace"
"son of Evar; son of the boar"
Similar sound: These names share phonetic patterns with Karsen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Norse/Scottish (via Carson) origins, giving them the same cultural heritage as Karsen.
Rhythm: Karsen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.