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"
"river, great water (from Zaire)"
"beauty, adornment, grace"
"good man, strong man"
"raven"
"he who holds firm the good"
"clay settlement, clay worker"
"resolute protector's son"
"fair, white, bright"
"thorny shrub, prickly plant"
"God has heard"
"slender, thin"
"one who cuts cloth, tailor"
"passionate, fiery one"
"God the highest (variant interpretation)"
"stone worker (via Mason)"
"God has heard (via Jaden influence)"
"group, band, team"
"fifth, born fifth"
"spear strength, brave with the spear"
"Yahweh is merciful"
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.