Karsen sits next to 3 phonetic neighbors — Carson, Karson, and Carsyn are the closest matches by sound. Most share Karsen's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of Carr, marsh dweller"
"slender, narrow"
"noble, of noble kind"
"rye meadow, rye clearing"
"son of Carr, marsh dweller"
"supplanter, one who follows at the heel"
"to obtain, to receive"
"fresh growth, spring"
"dear one, beloved"
"bright, shining one"
"princess of God"
"courage, spirit, determination"
"city of light, Varanasi"
"form of Michael/Micaiah"
"princess, lady"
"light"
"invented fictional name, inspired by Ashoka (without sorrow)"
"high chief of heaven"
"manly, virile"
"holding firm to goodness (feminine of Darius)"
"harmony, peace, concord"
Similar sound: These names share phonetic patterns with Karsen — 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 Karsen.
Rhythm: Karsen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.