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"
"noble friend, elf friend"
"world-encircling waters"
"son of Jeffrey, son of God's peace"
"soldier"
"visitor, pilgrim"
"king"
"peaceful ruler"
"beloved"
"pledge of peace"
"wholehearted (short for Caleb from Hebrew)"
"God is salvation, Yahweh saves"
"renowned warrior"
"garden, vineyard"
"thorny shrub, prickly plant"
"shelter, shield"
"genuine, honest, without deceit"
"statement of belief, system of faith"
"little red one (from red hair)"
"noble"
"may God protect"
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.