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"
"modern invented name"
"grace of God + home ruler"
"modern invented name"
"of the gods"
"modern variant of Milan/Milen"
"God is gracious"
"the kamani tree (Calophyllum inophyllum)"
"stag's clearing"
"courtesy, respect, gratitude"
"homestead on the rock"
"lion man (from Leander)"
"appointed by God"
"dweller at the edge of town"
"safe haven, shelter, refuge"
"the green one, the verdant, the ever-living"
"keen ruler, bold king"
"joyful, jovial (from the same root)"
"man of the forest"
"pillar, support"
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.