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"
"God the highest (variant interpretation)"
"dweller by wild land"
"clay settlement, clay worker"
"hollow, ravine"
"from the settlement by the stone"
"son of the cloud"
"abundant, bountiful"
"wanderer, Gaelic speaker"
"Yahweh is my flame"
"beauty, adornment, grace"
"free man"
"river, great water (from Zaire)"
"befitting a king"
"healer (via Jason/Iason)"
"chief desire"
"gift of God"
"settlement at the inhospitable place"
"great brightness, sea circle"
"world-mighty"
"from Dax, town 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.