Kristen sits next to 4 phonetic neighbors — Kristin, Christine, and Kristine are the closest matches by sound. Most share Kristen's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"follower of Christ"
"illusion"
"God is my oath, God is abundance"
"God is gracious"
"prosperous, rich"
"the sky, the heavens"
"gentle, delicate"
"my God is abundance"
"God has favored me"
"beloved, pure"
"hawk-like (possible alternative)"
"luminous, shining"
"freedom (when short for Liberty)"
"pure, chaste"
"friend, friendly"
"glowing coal in a meadow clearing"
"robin bird, red-breasted songbird"
"forever blooming"
"defender of men"
"noble, adorned + lake/waterfall"
"work, labor"
Similar sound: These names share phonetic patterns with Kristen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Kristen.
Rhythm: Kristen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.