Carsten sits next to 4 phonetic neighbors — Carson, Kirsten, and Karsten are the closest matches by sound. Most share Carsten's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"follower of Christ, anointed one"
"God is my strength"
"chief, lord"
"church, monastic cell"
"possibly skilled one or from Kaiser emperor"
"dwellers by the river forest"
"victory of the people"
"son of Jan"
"emperor, ruler"
"great, vast"
"one who resembles God"
"nobody, no one"
"army of the people, warrior of the nation"
"raised by God, established by YHWH"
"supplanter, heel-catcher"
"friend of elves, wise companion"
Similar sound: These names share phonetic patterns with Carsten — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Carsten.
Rhythm: Carsten is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.