Kaysen sits next to 5 phonetic neighbors — Jason, Mason, and Grayson are the closest matches by sound. Most share Kaysen's American English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"modern American creation"
"gift of God, blessed one"
"one who crafts arrows"
"fearless, not cowardly"
"shelter, shield"
"opportunity, happenstance"
"wise protector"
"lives near a bridge"
"rocky land, stony ground"
"God's peace, divine peace"
"long narrow hill"
"made by God"
"brave warrior (later folk etymology)"
"God is gracious"
"Yahweh is merciful"
"home ruler"
"estate of the fifth son"
"renowned warrior"
"toward the sea, seaward"
"herb farm, meadow settlement"
Similar sound: These names share phonetic patterns with Kaysen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have American English origins, giving them the same cultural heritage as Kaysen.
Rhythm: Kaysen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.