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"
"powerful leader of the folk"
"invented name, no established etymology"
"mill worker, grain grinder"
"gift, from the sea"
"one who serves"
"shallow river crossing"
"divine, god-like"
"dweller by the ridge"
"rocky land, stony ground"
"enthusiasm, ardent"
"slender, thin"
"younger, the son"
"home ruler"
"son of Cadan"
"rule, sovereignty"
"source of joy"
"royal ruler"
"to live, to dwell"
"nobleman, duke"
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.