Lucien sits next to 4 phonetic neighbors — Lucian, Lucius, and Julian are the closest matches by sound. Most share Lucien's French-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"light, luminous"
"spiritually reborn through baptism"
"wise protector"
"noble power, powerful ruler"
"spear ruler (from Gerald)"
"barrel maker, cask craftsman"
"protector of mankind"
"little warrior, young Mars"
"cloud, literary, scholarly (Vietnamese)"
"son of Judd"
"may God protect, holder of the heel"
"ruler of the army (Scandinavian form)"
"noble elder"
"great one, straining force"
"luminous circle, sacred light"
"strength, permanence"
"to run fast, a burst of speed"
"descendant of Flann (ruddy, red)"
"raven-like, dark as a raven"
"son of Brice"
"western town"
Similar sound: These names share phonetic patterns with Lucien — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Lucien.
Rhythm: Lucien is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.