Kacen sits next to 5 phonetic neighbors — Kason, Cason, and Mason are the closest matches by sound. Most share Kacen's American English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"modern invented name, no historical meaning"
"ocean, soaring sea"
"throne"
"dark red, crimson"
"river in Peru"
"small gift of God"
"from Airelle (Norman village)"
"powerful, energetic"
"green/fresh river"
"peace of the father"
"of the Sabine people"
"bald, little bald one"
"oak meadow, clearing in the oaks"
"modern invented name"
"friend of Yahweh"
"life's path, quest"
"fair, white, bright"
"son of Garret, son of the spear bearer"
"son of the grey-haired one"
"son of Hays, hedged area"
Similar sound: These names share phonetic patterns with Kacen — 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 Kacen.
Rhythm: Kacen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.