Kiersten sits next to 5 phonetic neighbors — Kirsten, Kristen, and Kirstin are the closest matches by sound. Most share Kiersten's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"follower of Christ, Christian"
"east settlement, east town"
"not known, mysterious"
"gift of God"
"rival, eager, industrious"
"bird, sparrow"
"sky, heaven (French ciel + -elle suffix)"
"perfect, complete"
"born in May, spring-like"
"lily flower"
"creative feminine form, unique identity"
"riverbank with a windlass"
"soft, tender"
"variant of Kaylee (pure)"
"descendant of the fire god"
"princess, lady"
"little wolf"
"flat tropical plain"
"lovely, good and beautiful"
"helpful one"
"moonlight, one related to the moon"
Similar sound: These names share phonetic patterns with Kiersten — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek/Latin origins, giving them the same cultural heritage as Kiersten.
Rhythm: Kiersten is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.