Jacen sits next to 5 phonetic neighbors — Jason, Jaden, and Jayson are the closest matches by sound. Most share Jacen's Greek-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"healer"
"thunder, of Thor"
"fair, fair-haired, white"
"God is my justice"
"gray-haired one from the valley"
"firebrand meadow, sword clearing"
"brilliant, shining"
"from Devon, the deep valley people"
"rock (from city of Tyre)"
"supplanter"
"free ruler, powerful peace"
"beloved, darling"
"great one"
"dedicated to Mars (god of war)"
"eagle land"
"forest dweller’s son"
"man of law, lawyer"
"supplanter (through Jay from Jason/James)"
"halls, rooms"
"place at the bow-shaped hill"
Similar sound: These names share phonetic patterns with Jacen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Jacen.
Rhythm: Jacen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.