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"
"high, exalted"
"rowan tree"
"will and fame"
"powerful natural force"
"moonlit, of the moon"
"courageous, valiant"
"bent river"
"enlightenment, awakening"
"guiding spirit"
"friend"
"lion, lion of God"
"ruler of peace"
"YHWH is gracious"
"friend, ally"
"cliff settlement"
"companion, friend"
"chosen deliverer, consecrated leader"
"crooked hill; bent (cam) nose (sron)"
"narrow land, island"
"woodland clearing used for hunting"
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.