Kirsten sits next to 4 phonetic neighbors — Kristen, Kirstin, and Kiersten are the closest matches by sound. Most share Kirsten's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"follower of Christ"
"high hill"
"little bird"
"bright clearing in the wood"
"prophetess of doom"
"modern invented name"
"God is my oath"
"lady, noble woman"
"calm waters"
"made of gold, golden-colored"
"beloved, wished-for child"
"ruler of the estate"
"God is gracious"
"great sea, son of the sea"
"grey-haired one"
"peace, wishes"
"rye clearing"
"house of God"
"flowing brightness, luminous"
"scholar, giving shelter"
"short form of Miranda, worthy of admiration"
Similar sound: These names share phonetic patterns with Kirsten — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin/Greek origins, giving them the same cultural heritage as Kirsten.
Rhythm: Kirsten is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.