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"
"small forest, wooded grove"
"great river (geographic)"
"brave power"
"canal worker, church official"
"my help is God"
"sun, sunshine"
"son of the earth-man"
"saint of God, blessed by God"
"Jehovah supports"
"crew, team, group"
"fallow land, meadowland"
"oak meadow, clearing in the oaks"
"consecrated, sacred"
"rapid water"
"meadow of the gods"
"son of Kenneth / son of Coinneach"
"champion, expert"
"steep valley settlement"
"creative modern variant of Ashton/Cashton"
"hard, unyielding"
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.