Lumen sits next to 4 phonetic neighbors — Loman, Lumen, and Roman are the closest matches by sound. Most share Lumen's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"opening, window of light"
"strong, firm, enduring"
"man from the Adriatic"
"playful one"
"bold confidence, striking presence"
"cloud"
"from Renton, town name"
"modern variant of David"
"creative combination name"
"dawn, new beginning"
"dear, beloved"
"from Brittany, land of the Britons"
"son of Walter, ruler of the army"
"noble heir, royal successor"
"dweller by the hedged forest"
"defender of men"
"summoner, one who calls forth"
"son of the wave, born of the sea"
"raven"
"guardian of riches"
"son, born of"
Similar sound: These names share phonetic patterns with Lumen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Lumen.
Rhythm: Lumen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.