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"
"large homestead"
"invented name; light or replica"
"from, of (noble German particle)"
"YHWH is gracious"
"the Lord is my God"
"from Airelle (Norman village)"
"saint of God, blessed by God"
"the Persian"
"warrior, strong fighter"
"God is gracious"
"elf ruler"
"Moorish, dark-complexioned"
"hazel valley dweller"
"bright, splendid"
"black, dark-haired"
"adapted from Kiristino (Ojibwe name for Cree people)"
"wanderer (from Scotti people's migrations)"
"one touched by good fortune"
"king, lord of the people"
"rhythm, flow, cadence"
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.