Lucus sits next to 4 phonetic neighbors — Lucas, Lukas, and Luke are the closest matches by sound. Most share Lucus's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"light, illumination"
"variant spelling of Caden/Kaden"
"ship's structural backbone"
"passionate devotion, fervor"
"storehouse, place of abundance (from silo)"
"dark red, crimson"
"keeper of the court"
"one who rides, horse rider"
"warrior's town"
"resolute protector"
"from Dreux (ancient French city name)"
"he gave"
"hunter's woodland"
"land beside the road"
"fortified stronghold"
"well-born, noble"
"son of Grace, gracious one"
"special, particular (German root)"
"from Ludwig/Louis (via Swedish)"
"from the ash tree dell"
Similar sound: These names share phonetic patterns with Lucus — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin lux origins, giving them the same cultural heritage as Lucus.
Rhythm: Lucus is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.