Karsten sits next to 4 phonetic neighbors — Carsten, Kirsten, and Carson are the closest matches by sound. Most share Karsten's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"follower of Christ, Christian"
"geographic name from ancient Gaulish"
"my God is light"
"spear ruler"
"son of David, son of the beloved"
"courtesy, respect, gratitude"
"young wolf"
"great, venerable"
"homestead on the rock"
"Yahweh is my God"
"gift of God"
"little fire (via Aiden root)"
"shining, bright"
"from the court"
"modern invented name, possibly eight (from Octavian)"
"ruler of the world"
"little king, of royal descent"
"son of Jack"
"ornament, necklace"
"descendant of Bradan (salmon)"
Similar sound: These names share phonetic patterns with Karsten — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Karsten.
Rhythm: Karsten is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.